diff --git a/src/physfs.c b/src/physfs.c
index e3a9fe1..d1c1455 100644
--- a/src/physfs.c
+++ b/src/physfs.c
@@ -798,8 +798,8 @@ static const char *find_filename_extension(const char *fname)
     const char *retval = NULL;
     if (fname != NULL)
     {
-        retval = strchr(fname, '.');
-        const char *p = retval;
+        const char *p = strchr(fname, '.');
+        retval = p;
 
         while (p != NULL)
         {
diff --git a/src/platform_windows.c b/src/platform_windows.c
index 6aa7394..e01f7c8 100644
--- a/src/platform_windows.c
+++ b/src/platform_windows.c
@@ -971,6 +971,7 @@ void *__PHYSFS_platformOpenAppend(const char *filename)
 } /* __PHYSFS_platformOpenAppend */
 
 
+/* !!! FIXME: this function fails if len > 0xFFFFFFFF. */
 PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buf, PHYSFS_uint64 len)
 {
     HANDLE Handle = ((WinApiFile *) opaque)->handle;
@@ -984,8 +985,9 @@ PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buf, PHYSFS_uint64 len)
 } /* __PHYSFS_platformRead */
 
 
+/* !!! FIXME: this function fails if len > 0xFFFFFFFF. */
 PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
-                                     PHYSFS_uint32 size, PHYSFS_uint32 count)
+                                     PHYSFS_uint64 len)
 {
     HANDLE Handle = ((WinApiFile *) opaque)->handle;
     DWORD CountOfBytesWritten = 0;