diff --git a/lib/Archive/ArchiveReader.cpp b/lib/Archive/ArchiveReader.cpp
index 262f170..8d87a67 100644
--- a/lib/Archive/ArchiveReader.cpp
+++ b/lib/Archive/ArchiveReader.cpp
@@ -187,7 +187,7 @@
   member->next = 0;
   member->prev = 0;
   member->parent = this;
-  member->path.setFile(pathname);
+  member->path.set(pathname);
   member->info.fileSize = MemberSize;
   member->info.modTime.fromEpochTime(atoi(Hdr->date));
   unsigned int mode;
diff --git a/lib/Archive/ArchiveWriter.cpp b/lib/Archive/ArchiveWriter.cpp
index be80b97..1318471 100644
--- a/lib/Archive/ArchiveWriter.cpp
+++ b/lib/Archive/ArchiveWriter.cpp
@@ -450,17 +450,17 @@
       // Close up shop
       FinalFile.close();
       arch.close();
-      TmpArchive.destroyFile();
+      TmpArchive.destroy();
 
     } else {
       // We don't have to insert the symbol table, so just renaming the temp
       // file to the correct name will suffice.
-      TmpArchive.renameFile(archPath);
+      TmpArchive.rename(archPath);
     }
   } catch (...) {
     // Make sure we clean up.
     if (TmpArchive.exists())
-      TmpArchive.destroyFile();
+      TmpArchive.destroy();
     throw;
   }
 }
diff --git a/lib/Bytecode/Archive/ArchiveReader.cpp b/lib/Bytecode/Archive/ArchiveReader.cpp
index 262f170..8d87a67 100644
--- a/lib/Bytecode/Archive/ArchiveReader.cpp
+++ b/lib/Bytecode/Archive/ArchiveReader.cpp
@@ -187,7 +187,7 @@
   member->next = 0;
   member->prev = 0;
   member->parent = this;
-  member->path.setFile(pathname);
+  member->path.set(pathname);
   member->info.fileSize = MemberSize;
   member->info.modTime.fromEpochTime(atoi(Hdr->date));
   unsigned int mode;
diff --git a/lib/Bytecode/Archive/ArchiveWriter.cpp b/lib/Bytecode/Archive/ArchiveWriter.cpp
index be80b97..1318471 100644
--- a/lib/Bytecode/Archive/ArchiveWriter.cpp
+++ b/lib/Bytecode/Archive/ArchiveWriter.cpp
@@ -450,17 +450,17 @@
       // Close up shop
       FinalFile.close();
       arch.close();
-      TmpArchive.destroyFile();
+      TmpArchive.destroy();
 
     } else {
       // We don't have to insert the symbol table, so just renaming the temp
       // file to the correct name will suffice.
-      TmpArchive.renameFile(archPath);
+      TmpArchive.rename(archPath);
     }
   } catch (...) {
     // Make sure we clean up.
     if (TmpArchive.exists())
-      TmpArchive.destroyFile();
+      TmpArchive.destroy();
     throw;
   }
 }
diff --git a/lib/Debugger/ProgramInfo.cpp b/lib/Debugger/ProgramInfo.cpp
index 144cfeb..b55606b 100644
--- a/lib/Debugger/ProgramInfo.cpp
+++ b/lib/Debugger/ProgramInfo.cpp
@@ -172,8 +172,8 @@
   if (SourceText == 0) { // Read the file in if we haven't already.
     sys::Path tmpPath;
     if (!Directory.empty())
-      tmpPath.setDirectory(Directory);
-    tmpPath.appendFile(BaseName);
+      tmpPath.set(Directory);
+    tmpPath.appendComponent(BaseName);
     if (tmpPath.canRead())
       SourceText = new SourceFile(tmpPath.toString(), Descriptor);
     else
diff --git a/lib/Linker/LinkModules.cpp b/lib/Linker/LinkModules.cpp
index 23ba6eb..d20044f 100644
--- a/lib/Linker/LinkModules.cpp
+++ b/lib/Linker/LinkModules.cpp
@@ -899,7 +899,7 @@
   // If the source library's module id is in the dependent library list of the
   // destination library, remove it since that module is now linked in.
   sys::Path modId;
-  modId.setFile(Src->getModuleIdentifier());
+  modId.set(Src->getModuleIdentifier());
   if (!modId.isEmpty())
     Dest->removeLibrary(modId.getBasename());
 
diff --git a/lib/Linker/Linker.cpp b/lib/Linker/Linker.cpp
index 3371740..c72f1b5 100644
--- a/lib/Linker/Linker.cpp
+++ b/lib/Linker/Linker.cpp
@@ -69,7 +69,6 @@
 
 void
 Linker::addPath(const sys::Path& path) {
-  assert(path.isDirectory() && "Can only insert directories into the path");
   LibPaths.push_back(path);
 }
 
@@ -77,7 +76,7 @@
 Linker::addPaths(const std::vector<std::string>& paths) {
   for (unsigned i = 0; i != paths.size(); ++i) {
     sys::Path aPath;
-    aPath.setDirectory(paths[i]);
+    aPath.set(paths[i]);
     LibPaths.push_back(aPath);
   }
 }
@@ -118,26 +117,35 @@
 static inline sys::Path IsLibrary(const std::string& Name,
                                   const sys::Path& Directory) {
 
-  assert(Directory.isDirectory() && "Need to specify a directory");
   sys::Path FullPath(Directory);
-  FullPath.appendFile("lib" + Name);
 
-  FullPath.appendSuffix("a");
-  if (FullPath.isArchive())
-    return FullPath;
+  // Make sure the directory actually is a directory in the file system.
+  if (FullPath.isDirectory())
+  {
+    // Try the libX.a form
+    FullPath.appendComponent("lib" + Name);
+    FullPath.appendSuffix("a");
+    if (FullPath.isArchive())
+      return FullPath;
 
-  FullPath.elideSuffix();
-  FullPath.appendSuffix("bca");
-  if (FullPath.isArchive())
-    return FullPath;
+    // Try the libX.bca form
+    FullPath.eraseSuffix();
+    FullPath.appendSuffix("bca");
+    if (FullPath.isArchive())
+      return FullPath;
 
-  FullPath.elideSuffix();
-  FullPath.appendSuffix(&(LTDL_SHLIB_EXT[1]));
-  if (FullPath.isDynamicLibrary())  // Native shared library?
-    return FullPath;
-  if (FullPath.isBytecodeFile())    // .so file containing bytecode?
-    return FullPath;
+    // Try the libX.so form
+    FullPath.eraseSuffix();
+    FullPath.appendSuffix(&(LTDL_SHLIB_EXT[1]));
+    if (FullPath.isDynamicLibrary())  // Native shared library?
+      return FullPath;
+    if (FullPath.isBytecodeFile())    // .so file containing bytecode?
+      return FullPath;
 
+    // Not found .. fall through
+  }
+
+  // Indicate that the library was not found in the directory.
   FullPath.clear();
   return FullPath;
 }
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index 77c97f3..88c3515 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -45,9 +45,9 @@
   // if ProgramPath contains at least one / character, indicating that it is a
   // relative path to bugpoint itself.
   sys::Path Result ( ProgramPath );
-  Result.elideFile();
+  Result.eraseComponent();
   if (!Result.isEmpty()) {
-    Result.appendFile(ExeName);
+    Result.appendComponent(ExeName);
     if (Result.canExecute())
       return Result;
   }
diff --git a/lib/Support/ToolRunner.cpp b/lib/Support/ToolRunner.cpp
index 9ef14c5..4a08e1a 100644
--- a/lib/Support/ToolRunner.cpp
+++ b/lib/Support/ToolRunner.cpp
@@ -65,7 +65,7 @@
     ErrorFile.close();
   }
 
-  ErrorFilename.destroyFile();
+  ErrorFilename.destroy();
   throw ToolExecutionError(OS.str());
 }
 
@@ -176,7 +176,7 @@
 void LLC::compileProgram(const std::string &Bytecode) {
   sys::Path OutputAsmFile;
   OutputAsm(Bytecode, OutputAsmFile);
-  OutputAsmFile.destroyFile();
+  OutputAsmFile.destroy();
 }
 
 int LLC::ExecuteProgram(const std::string &Bytecode,
@@ -321,7 +321,7 @@
 void CBE::compileProgram(const std::string &Bytecode) {
   sys::Path OutputCFile;
   OutputC(Bytecode, OutputCFile);
-  OutputCFile.destroyFile();
+  OutputCFile.destroy();
 }
 
 int CBE::ExecuteProgram(const std::string &Bytecode,
diff --git a/lib/System/Path.cpp b/lib/System/Path.cpp
index d2566fd0..9ee0a3e 100644
--- a/lib/System/Path.cpp
+++ b/lib/System/Path.cpp
@@ -27,7 +27,7 @@
 Path::GetLLVMConfigDir() {
   Path result;
 #ifdef LLVM_ETCDIR
-  if (result.setDirectory(LLVM_ETCDIR))
+  if (result.set(LLVM_ETCDIR))
     return result;
 #endif
   return GetLLVMDefaultConfigDir();
@@ -80,10 +80,10 @@
   GetSystemLibraryPaths(LibPaths);
   for (unsigned i = 0; i < LibPaths.size(); ++i) {
     sys::Path FullPath(LibPaths[i]);
-    FullPath.appendFile("lib" + name + LTDL_SHLIB_EXT);
+    FullPath.appendComponent("lib" + name + LTDL_SHLIB_EXT);
     if (FullPath.isDynamicLibrary())
       return FullPath;
-    FullPath.elideSuffix();
+    FullPath.eraseSuffix();
     FullPath.appendSuffix("a");
     if (FullPath.isArchive())
       return FullPath;
diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index f871adb..ffcd694 100644
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -84,7 +84,7 @@
 Path
 Path::GetRootDirectory() {
   Path result;
-  result.setDirectory("/");
+  result.set("/");
   return result;
 }
 
@@ -98,7 +98,7 @@
   if (0 == mkdtemp(pathname))
     ThrowErrno(std::string(pathname) + ": can't create temporary directory");
   Path result;
-  result.setDirectory(pathname);
+  result.set(pathname);
   assert(result.isValid() && "mkdtemp didn't create a valid pathname!");
   return result;
 #elif defined(HAVE_MKSTEMP)
@@ -117,7 +117,7 @@
   if (-1 == ::mkdir(pathname, S_IRWXU)) // end race condition
     ThrowErrno(std::string(pathname) + ": can't create temporary directory");
   Path result;
-  result.setDirectory(pathname);
+  result.set(pathname);
   assert(result.isValid() && "mkstemp didn't create a valid pathname!");
   return result;
 #elif defined(HAVE_MKTEMP)
@@ -134,7 +134,7 @@
   if (-1 == ::mkdir(TmpName, S_IRWXU))
     ThrowErrno(std::string(TmpName) + ": can't create temporary directory");
   Path result;
-  result.setDirectory(TmpName);
+  result.set(TmpName);
   assert(result.isValid() && "mktemp didn't create a valid pathname!");
   return result;
 #else
@@ -155,7 +155,7 @@
   if (-1 == ::mkdir(pathname, S_IRWXU))
     ThrowErrno(std::string(pathname) + ": can't create temporary directory");
   Path result;
-  result.setDirectory(pathname);
+  result.set(pathname);
   assert(result.isValid() && "mkstemp didn't create a valid pathname!");
   return result;
 #endif
@@ -167,14 +167,14 @@
   Path tmpPath;
   while( delim != 0 ) {
     std::string tmp(at, size_t(delim-at));
-    if (tmpPath.setDirectory(tmp))
+    if (tmpPath.set(tmp))
       if (tmpPath.canRead())
         Paths.push_back(tmpPath);
     at = delim + 1;
     delim = strchr(at, ':');
   }
   if (*at != 0)
-    if (tmpPath.setDirectory(std::string(at)))
+    if (tmpPath.set(std::string(at)))
       if (tmpPath.canRead())
         Paths.push_back(tmpPath);
 
@@ -204,7 +204,7 @@
 #ifdef LLVM_LIBDIR
   {
     Path tmpPath;
-    if (tmpPath.setDirectory(LLVM_LIBDIR))
+    if (tmpPath.set(LLVM_LIBDIR))
       if (tmpPath.canRead())
         Paths.push_back(tmpPath);
   }
@@ -222,7 +222,7 @@
   const char* home = getenv("HOME");
   if (home) {
     Path result;
-    if (result.setDirectory(home))
+    if (result.set(home))
       return result;
   }
   return GetRootDirectory();
@@ -230,12 +230,20 @@
 
 bool
 Path::isFile() const {
-  return (isValid() && path[path.length()-1] != '/');
+  struct stat buf;
+  if (0 != stat(path.c_str(), &buf)) {
+    ThrowErrno(path + ": can't determine type of path object: ");
+  }
+  return S_ISREG(buf.st_mode);
 }
 
 bool
 Path::isDirectory() const {
-  return (isValid() && path[path.length()-1] == '/');
+  struct stat buf;
+  if (0 != stat(path.c_str(), &buf)) {
+    ThrowErrno(path + ": can't determine type of path object: ");
+  }
+  return S_ISDIR(buf.st_mode);
 }
 
 std::string
@@ -357,8 +365,6 @@
   info.user = buf.st_uid;
   info.group = buf.st_gid;
   info.isDir = S_ISDIR(buf.st_mode);
-  if (info.isDir && path[path.length()-1] != '/')
-    path += '/';
 }
 
 static bool AddPermissionBits(const std::string& Filename, int bits) {
@@ -419,8 +425,6 @@
         ThrowErrno(aPath.path + 
           ": can't determine file object type", stat_errno);
       }
-      if (S_ISDIR(buf.st_mode))
-        aPath.path += "/";
       result.insert(aPath);
     }
   }
@@ -430,124 +434,84 @@
 }
 
 bool
-Path::setDirectory(const std::string& a_path) {
-  if (a_path.size() == 0)
+Path::set(const std::string& a_path) {
+  if (a_path.empty())
     return false;
-  Path save(*this);
+  std::string save(path);
   path = a_path;
-  size_t last = a_path.size() -1;
-  if (a_path[last] != '/')
-    path += '/';
   if (!isValid()) {
-    path = save.path;
+    path = save;
     return false;
   }
   return true;
 }
 
 bool
-Path::setFile(const std::string& a_path) {
-  if (a_path.size() == 0)
+Path::appendComponent(const std::string& name) {
+  if (name.empty())
     return false;
-  Path save(*this);
-  path = a_path;
-  size_t last = a_path.size() - 1;
-  while (last > 0 && a_path[last] == '/')
-    last--;
-  path.erase(last+1);
+  std::string save(path);
+  if (!path.empty()) {
+    size_t last = path.size() - 1;
+    if (path[last] != '/') 
+      path += '/';
+  }
+  path += name;
   if (!isValid()) {
-    path = save.path;
+    path = save;
     return false;
   }
   return true;
 }
 
 bool
-Path::appendDirectory(const std::string& dir) {
-  if (isFile()) 
-    return false;
-  Path save(*this);
-  path += dir;
-  path += "/";
-  if (!isValid()) {
-    path = save.path;
-    return false;
-  }
-  return true;
-}
-
-bool
-Path::elideDirectory() {
-  if (isFile()) 
-    return false;
+Path::eraseComponent() {
   size_t slashpos = path.rfind('/',path.size());
-  if (slashpos == 0 || slashpos == std::string::npos)
-    return false;
+  if (slashpos == 0 || slashpos == std::string::npos) {
+    path.erase();
+    return true;
+  }
   if (slashpos == path.size() - 1)
     slashpos = path.rfind('/',slashpos-1);
-  if (slashpos == std::string::npos)
-    return false;
+  if (slashpos == std::string::npos) {
+    path.erase();
+    return true;
+  }
   path.erase(slashpos);
   return true;
 }
 
 bool
-Path::appendFile(const std::string& file) {
-  if (!isDirectory()) 
-    return false;
-  Path save(*this);
-  path += file;
-  if (!isValid()) {
-    path = save.path;
-    return false;
-  }
-  return true;
-}
-
-bool
-Path::elideFile() {
-  if (isDirectory()) 
-    return false;
-  size_t slashpos = path.rfind('/',path.size());
-  if (slashpos == std::string::npos)
-    return false;
-  path.erase(slashpos+1);
-  return true;
-}
-
-bool
 Path::appendSuffix(const std::string& suffix) {
-  if (isDirectory()) 
-    return false;
-  Path save(*this);
+  std::string save(path);
   path.append(".");
   path.append(suffix);
   if (!isValid()) {
-    path = save.path;
+    path = save;
     return false;
   }
   return true;
 }
 
-bool 
-Path::elideSuffix() {
-  if (isDirectory()) return false;
+bool
+Path::eraseSuffix() {
+  std::string save(path);
   size_t dotpos = path.rfind('.',path.size());
   size_t slashpos = path.rfind('/',path.size());
-  if (slashpos != std::string::npos && dotpos != std::string::npos &&
+  if (slashpos != std::string::npos && 
+      dotpos != std::string::npos &&
       dotpos > slashpos) {
     path.erase(dotpos, path.size()-dotpos);
-    return true;
   }
-  return false;
+  if (!isValid()) {
+    path = save;
+    return false;
+  }
+  return true;
 }
 
-
 bool
 Path::createDirectory( bool create_parents) {
-  // Make sure we're dealing with a directory
-  if (!isDirectory()) return false;
-
   // Get a writeable copy of the path name
   char pathname[MAXPATHLEN];
   path.copy(pathname,MAXPATHLEN);
@@ -586,9 +550,6 @@
 
 bool
 Path::createFile() {
-  // Make sure we're dealing with a file
-  if (!isFile()) return false; 
-
   // Create the file
   int fd = ::creat(path.c_str(), S_IRUSR | S_IWUSR);
   if (fd < 0)
@@ -600,10 +561,6 @@
 
 bool
 Path::createTemporaryFile(bool reuse_current) {
-  // Make sure we're dealing with a file
-  if (!isFile()) 
-    return false;
-
   // Make this into a unique file name
   makeUnique( reuse_current );
 
@@ -617,45 +574,38 @@
 }
 
 bool
-Path::destroyDirectory(bool remove_contents) const {
+Path::destroy(bool remove_contents) const {
   // Make sure we're dealing with a directory
-  if (!isDirectory()) return false;
-
-  // If it doesn't exist, we're done.
-  if (!exists()) return true;
-
-  if (remove_contents) {
-    // Recursively descend the directory to remove its content
-    std::string cmd("/bin/rm -rf ");
-    cmd += path;
-    system(cmd.c_str());
-  } else {
-    // Otherwise, try to just remove the one directory
-    char pathname[MAXPATHLEN];
-    path.copy(pathname,MAXPATHLEN);
-    int lastchar = path.length() - 1 ; 
-    if (pathname[lastchar] == '/') 
-      pathname[lastchar] = 0;
-    else
-      pathname[lastchar+1] = 0;
-    if ( 0 != rmdir(pathname))
-      ThrowErrno(std::string(pathname) + ": can't destroy directory");
+  if (isFile()) {
+    if (0 != unlink(path.c_str()))
+      ThrowErrno(path + ": can't destroy file");
+  } else if (isDirectory()) {
+    if (remove_contents) {
+      // Recursively descend the directory to remove its content
+      std::string cmd("/bin/rm -rf ");
+      cmd += path;
+      system(cmd.c_str());
+    } else {
+      // Otherwise, try to just remove the one directory
+      char pathname[MAXPATHLEN];
+      path.copy(pathname,MAXPATHLEN);
+      int lastchar = path.length() - 1 ; 
+      if (pathname[lastchar] == '/') 
+        pathname[lastchar] = 0;
+      else
+        pathname[lastchar+1] = 0;
+      if ( 0 != rmdir(pathname))
+        ThrowErrno(std::string(pathname) + ": can't destroy directory");
+    }
   }
+  else
+    return false;
   return true;
 }
 
 bool
-Path::destroyFile() const {
-  if (!isFile()) return false;
-  if (0 != unlink(path.c_str()))
-    ThrowErrno(path + ": can't destroy file");
-  return true;
-}
-
-bool
-Path::renameFile(const Path& newName) {
-  if (!isFile()) return false;
-  if (0 != rename(path.c_str(), newName.c_str()))
+Path::rename(const Path& newName) {
+  if (0 != ::rename(path.c_str(), newName.c_str()))
     ThrowErrno(std::string("can't rename '") + path + "' as '" + 
                newName.toString() + "' ");
   return true;
@@ -663,7 +613,6 @@
 
 bool
 Path::setStatusInfo(const StatusInfo& si) const {
-  if (!isFile()) return false;
   struct utimbuf utb;
   utb.actime = si.modTime.toPosixTime();
   utb.modtime = utb.actime;
diff --git a/lib/System/Unix/Program.inc b/lib/System/Unix/Program.inc
index 774bd02..8aa0705 100644
--- a/lib/System/Unix/Program.inc
+++ b/lib/System/Unix/Program.inc
@@ -42,7 +42,7 @@
   if (progName.length() == 0) // no program
     return Path();
   Path temp;
-  if (!temp.setFile(progName)) // invalid name
+  if (!temp.set(progName)) // invalid name
     return Path();
   // FIXME: have to check for absolute filename - we cannot assume anything
   // about "." being in $PATH
@@ -64,8 +64,8 @@
 
     // Check to see if this first directory contains the executable...
     Path FilePath;
-    if (FilePath.setDirectory(std::string(PathStr,Colon))) {
-      FilePath.appendFile(progName);
+    if (FilePath.set(std::string(PathStr,Colon))) {
+      FilePath.appendComponent(progName);
       if (FilePath.canExecute())
         return FilePath;                    // Found the executable!
     }
diff --git a/lib/System/Unix/Signals.inc b/lib/System/Unix/Signals.inc
index d02d200..ce5b94b 100644
--- a/lib/System/Unix/Signals.inc
+++ b/lib/System/Unix/Signals.inc
@@ -112,7 +112,7 @@
 
   if (DirectoriesToRemove != 0)
     while (!DirectoriesToRemove->empty()) {
-      DirectoriesToRemove->back().destroyDirectory(true);
+      DirectoriesToRemove->back().destroy(true);
       DirectoriesToRemove->pop_back();
     }
 
diff --git a/lib/System/Win32/Path.inc b/lib/System/Win32/Path.inc
index b9132da..6c80834 100644
--- a/lib/System/Win32/Path.inc
+++ b/lib/System/Win32/Path.inc
@@ -195,12 +195,18 @@
 
 bool
 Path::isFile() const {
-  return (isValid() && path[path.length()-1] != '/');
+  WIN32_FILE_ATTRIBUTE_DATA fi;
+  if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
+    ThrowError(std::string(path) + ": Can't get status: ");
+  return fi.dwFileAttributes & FILE_ATTRIBUTE_NORMAL;
 }
 
 bool
 Path::isDirectory() const {
-  return (isValid() && path[path.length()-1] == '/');
+  WIN32_FILE_ATTRIBUTE_DATA fi;
+  if (!GetFileAttributesEx(path.c_str(), GetFileExInfoStandard, &fi))
+    ThrowError(std::string(path) + ": Can't get status: ");
+  return fi.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
 }
 
 std::string