6b6ae5dedb
If the extension is not found, string::rfind() returns -1,
That can still match unrelated file if the file-name is one
char longer than an arbitrary extension.
eg. "foo" matched ".aiff" because
-1 = strlen("foo") - strlen(".aiff")
Also due to a missing comma ".VOC.vwe" matched any file shorter
than 7 chars in length.
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