I am using CS5 and have received the error on a file I have been working on stating that "flash can not parse this document." Searching the internet I am assuming that all of my hours of work are now lost. Any help please to recover my document would be appriciated. I do not see anyway to post the document to the site for debugging.
1. rename the fla to a rar and use winrar to repair. rename the repaired rar to a fla and see if flash pro can open
2. unrar the renamed fla and recover some of the assets
3. if you have a working swf, decompile (eg, using sothink's decompiler).
So both of those fixes are rather dirty fixes (which both worked), what I managed to get to work was open in CS6 then save as a CS5 and that worked.