I assume that you're trying to open FLAs that you only had stored locally. There's no magic wand to wave on that. it *is* probably good motivation to come up with a solid backup strategy for moving forward. We've all been there.
There are professional data recovery services that you could theoretically send the disk to, but if you've been writing a bunch of stuff to the disk since you accidentally deleted the files that you cared about, there's no guarantee that you haven't overwritten those missing portions with new data. This is a forum about Flash Player, not data recovery, so we're not really the best authorities on that front.
If you have the SWFs, you might have better luck using one of the commercial SWF disassembly tools to work your way backwards to editable content. It's not super convenient, but it's not uncommon for someone to need to edit a SWF long after the designer/developer has moved on and the FLAs are lost to history.
In your case, it seems that your deleted files might be partially overwritten and that's why they become inaccessible after recovery.
Note: In data deletion case it is always recommended to not to use the drive as the further usage of drive overwrite the blank space of deleted files and make deleted files recovery impossible. No data recovery software can recover files from the overwritten hard drive.
In addition: I know you have already tried many tools for your lost file recovery nevertheless, i would suggest you to give a shot to Free data recovery software of Stellar.
Hope it may work for you!