From Microsoft Paint to Photoshop (or any other soft) u can change that way:

1. Open up the registry editor (Regedit.exe) as an administrator
2. HKEY_CLASSES_ROOT -> SystemFileAssociations -> image -> shell -> edit -> command
3. Double click on Default (on right window) and change path to whatever u want
4. OK
5. enjoy

print value is next to edit

If u need more values “Edit with…” or “Open with” with different soft then do this:

1. Open up the registry editor (Regedit.exe) as an administrator
2. HKEY_CLASSES_ROOT -> * -> Shell
3. New -> Key (name Edit with Photoshop)
4. New -> Key (name command)
5. Double click on Default (on right window) and show path to whatever u want and %1
should be like this: “C:\Program Files\Adobe\Adobe Photoshop CS4 (64 Bit)\Photoshop.exe” %1
6. OK
7. enjoy

U can add as many as u need “Edit with…”