I suddenly ran out of harddrive space and Flash crashed while saving and corrupted my main .fla file!!! Good thing I backup my files every day, and my to-do list says I've only made 1 change to the file today.
Can't you use flash decompilers to convert .swf files to their .fla form?
I mean... I might be wrong... and even if I'm not, they might not work perfectly, but if it's true, you could theoretically (at least in this scenario) just paid a bit of money (inconvenient, definitely) and used the EBF4ver0.2 swf you uploaded here, and have all the data from the second beta stage retrieved... I think.
I mean, I don't know if that works... and even if it does, it'd be inconvenient... and if you hadn't uploaded it, you'd still be screwed... but it would beat remaking the game from scratch.