If both the works PC and the home PC are XP and if Photo Editor is the same version on each machine, then that's very strange.
So, what's different? What is the 'full text' of the error message?
How do you open these files? The methods are;
1] Double click the file
2] Right click the file, select Open.
3] Right click the file, select "Open with", then choose the application.
4] Open Photo Editor first, then go to File > Open, navigate to the file location, and select it.
if you have not tried option 4 yet, try that and tell us what happens, with any error messages.
I just switched to a different PC at my office, and copied over
Microsoft Photo Editor from my previous machine. On that machine, I
regularly used this software to open .PCX files. On this machine, Photo
Editor does not recognize .PCX as a file type.
Is there something I can do to modify that? It's the same version of
the software, so I don't understand why this happens.