Photoshop: Not a valid Photoshop document

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My daughter has been using 2019 Photoshop CC, updated to 2020.  She is a novice, I don't  know even less about Photoshop I'm afraid, so please :) bear with me...  She inadvertently deleted a Photoshop file with "a lot of layers" from her computer...permanently.  We used a recovery program and have managed to recover what looks to be the file, though when she tries to open, gets the error message Could Not Open because it is not a valid Photoshop document.  We have looked around the internet and tried a few things (like changing the file extension to TIFF and pdf), but so far no luck.  The file is 9.57 MB.  I am willing to upload somewhere if anyone is up for troubleshooting.  Please help, she is desperate!
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LCF

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Posted 6 months ago

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Cristen Gillespie

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Have you tried right-clicking on it in Finder/Explorer and seeing if the OS can suggest any other program for opening it? It might be good to know it even recognizes it as an image file. Since it's layered, unless she saved with Maximize Compatibility ON (Preferences> File Handling), she may not even be able to find any app that can open it even flattened.

If you say what OS you're running and what recovery app you've already tried, your other chance would be if someone here can recommend a program more likely to succeed in actually recovering the file—assuming she hasn't overwritten it with a save to the hard drive.

Most of us have done this once. It's quite a teaching moment, I'm afraid.
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LCF

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Thanks for your response.  It does try to open with Photoshop when I double click on it and has since initially recovered.   If I right click and look for suggestions in the Microsoft Store, they're all image editing apps, so I think it is being recognized as an image file.  I don't believe she had Maximize Compatibility on, I think it was set to Ask and I changed it to Always when I was puttering around earlier today, at least as far as I can remember!  I'm on Win10.  I've been able to recover the same deleted file using two different recovery tools (one being Recuva), but again, this recovered file gives me that invalid file message when Photoshop tries to open.  I feel like the file needs a repair job, but none of them seem to be working. 
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Cristen Gillespie

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Okay, that's a step in the right direction. The problem will likely be not having Maximize Compatibility ON in getting even a flattened version to use—I've long wished they'd make that the default. Saving disk space isn't quite the big deal it was back in olden times. It only increases file size by one image layer, and considering how big we're making our files today, that's a drop in the bucket.

As for a repair job, there likely is something for Win that will try to repair things like file headers that have become corrupt. Your recovery software probably already tried, or did just that. Sad to say, I've never heard anyone say that if you're using PS, you can get a corrupt file repaired and opened with XXX software.

Because you say you're desperate:  I'd try opening it  with apps that my OS said might work for it, even PS 2019 that she started with just to rule it out—at least you're trying to find something that will open it besides 2020. From the small file size, she painted or drew it, meaning it's much more difficult to reconstruct, even from a flattened image if you can get it to open in something?

Other than going that route at this point, if she'd rather wait until Adobe staff returns from their weekend and hopefully get a chance to spot this, then they'll know what, if anything, can be done with recovering a layered PSD.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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If you can share a link to the file (CC files or Dropbox or some similar service) I can ask an engineer to take a look. No promises that anything can be recovered but can ask.
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Andrew Sender, Employee

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Hi,
Can you try enabling Preferences -> Performance -> Legacy Compositing?  Other customers have seen similar issues to this?

Sincerely,
Andrew
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JOHN WALCOTT

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have you tried changing the suffix to .psd?