Thanks to a comment posted by one of my readers, I fixed a tiny (but problematic) bug in my SWFHeaderInfo class.
You can find the new file here. The link points to a zip file with the source and the library bundled together.
The error was an oversight on my part. When decompressing a swf file I neglected to close the file on the disk before returning a new MemoryStream. This prevented all access to the swf file because the file was marked as in use. The issue has been fixed, and I apologize for any inconvenience it may have caused!

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