"Could not complete your request because it is not the right kind of document" When opening a .PSD

I found that Bridge could read mistyped filenamed files as long as the original file format was one readable by Bridge. So for example, I have a PDF, I rename it as a .psd, then Bridge can still show me the thumbnail. That gives a first clue of what has happened. If Bridge cannot show the thumbnail, then it's more likely a corrupted file.
Now to discover which file format it has to be renamed to, in the case of the former, then the thumbnail might show a clue (a what is clearly a vector document etc...)...
Of course this is no help for the OP 🙂

That is either a corrupt file, or a file of another file type saved with an incorrect file extension (an example would be a TIFF with a PSD file extension)

Did you save to a local drive within your computer, an external drive or a network drive? If it was a network drive, try copying it to a local drive first, then opening it.

Dave