Flash CS 5.5 Unexpected File Format

I have been working on a flash movie all day.I shutdown my computer and rebooted it.Now when I go to open my .fla it says "unexpected file format".

I stupidly wrote all actionscript on the timeline.

What could be the problem?

Is there 开发者_C百科anyway to salvage this file?

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.fla is a proprietary, binary file. So if Flash is not able to open it, then I guess it is damaged and can’t be opened.