RISCOS changes by dschwertberger.
diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index 1f12099..fe54cc5 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -1,5 +1,12 @@
 """Guess which db package to use to open a db file."""
 
+import os
+
+if os.sep==".":
+    endsep = "/"
+else:
+    endsep = "."
+ 
 def whichdb(filename):
     """Guess which db package to use to open a db file.
 
@@ -17,9 +24,9 @@
 
     # Check for dbm first -- this has a .pag and a .dir file
     try:
-        f = open(filename + ".pag", "rb")
+        f = open(filename + endsep + "pag", "rb")
         f.close()
-        f = open(filename + ".dir", "rb")
+        f = open(filename + endsep + "dir", "rb")
         f.close()
         return "dbm"
     except IOError:
@@ -27,9 +34,9 @@
 
     # Check for dumbdbm next -- this has a .dir and and a .dat file
     try:
-        f = open(filename + ".dat", "rb")
+        f = open(filename + endsep + "dat", "rb")
         f.close()
-        f = open(filename + ".dir", "rb")
+        f = open(filename + endsep + "dir", "rb")
         try:
             if f.read(1) in ["'", '"']:
                 return "dumbdbm"