Do you get any error message or does Photoshop crash?
How are you trying to open it and what error message are getting?
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Ultimate solution which might more effective than all listed is photoshop psd recovery
It is helpful tip - https://helpx.adobe.com/photoshop/kb/basic-troubleshooting.html
This one artilce from Adobe, is also can assist you: https://helpx.adobe.com/photoshop/kb/file-recovery-photoshop.html
· Open "My Computer." In Windows XP, the icon is on the desktop. In Windows Vista or Windows 7, you must access this via the "Computer" option in the Start menu.
· Double-click the "C" drive, followed by the "Windows" folder inside. Locate the temporary Photoshop folder, which will look similar to this: "Photoshop Temp6382948398." Double-click the folder when you find it.
· Locate the file inside the temporary folder that matches the name of the corrupted file. Double-click it to open it in Photoshop.
· Click "Save As" in the "File" portion of the main menu bar. Save it in a different location and under a different name.
Yeah. I believe that we need more detail, please. What happens, exactly, when you try to open it? Nothing? Any error message? Etc..?
Thanks so much.