Win: Fix typo and incorrect strlen for finding/loading ICDs.
diff --git a/loader/loader_platform.h b/loader/loader_platform.h
index 230ee5d..08ce208 100644
--- a/loader/loader_platform.h
+++ b/loader/loader_platform.h
@@ -159,7 +159,7 @@
#define DEFAULT_VK_DRIVERS_PATH "C:\\Windows\\System32"
// TODO/TBD: Is this an appropriate prefix for Windows?
#define VK_DRIVER_LIBRARY_PREFIX "VK_"
-#define VK_DRIVER_LIBRARY_PREFIX_LEN 4
+#define VK_DRIVER_LIBRARY_PREFIX_LEN 3
// TODO/TBD: Is this an appropriate suffix for Windows?
#define VK_LAYER_LIBRARY_PREFIX "VKLayer"
#define VK_LAYER_LIBRARY_PREFIX_LEN 8