MP4FileLib.dll is the file I am talking. It's part of the software named Mpegable DS and probably it's the filter that it's registered to decode MP4 streams. This error it's pretty common and in some cases was solved by downloading / copying this file into windows/system32 folder.
To realy find out witch filters are used, open the file, rightclick-> options -> filters ->advanced and post here the files named to be used.
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