So every time I try to open this file as a psd, Photoshop gives me an error message that says "Could not complete your request because it is not a valid photoshop document". I can't imagine the files are corrupted because I received them from a printing company who were nice enough to give me copies because my personal files were lost. I opened them as png and that worked, I received them through an email and they had no file extension, it wasn't a png or psd, just blank. The time I sent them to that company was in 2015 and I just now received them. I want to be able to open them as a psd so I can work with the layers.
This looks like a duplicate of your other post. If those files are pngs (as per the other post use notepad to check) then the layers are lost (png does not support layers)