There are ways to re-set or establish associations between file and program in Windows 10.

I'm on a dsl connection, with a static ip, firewall (freedom 2.0) & my files sharing turned off.I'd like to allow my work computer, again with a static address, to access my computer so I can ...

Open the folder where Photoshop is installed. The default path is "C:/Program Files/Adobe/Photoshop /" (replace "" with your version of Photoshop). You can find this by opening "My Computer ...

In most cases, if you find yourself unable to open a particular file type on a PC, it's because you do not have the program that runs that type of file.