Find a picture file that you want Adobe Photoshop to open, right click it, then choose "Open with".
The next step depends upon which Windows OS you are using.
If Windows XP, a new menu will appear. Select Choose program. In the dialogue window that appears scrol down and highlight Adobe Photoshop. Make sure the "Always use the selected program to open this kind of file" is ticked, then click OK.
If Windows 9x or ME, you will go straight to the Open with dialogue window.
Hope this helps.
When I hit edit, MS Paint launches as the default editor. How do I (or can I) change it to Adobe Photoshop? I like P&F Viewer to scan photos, but it would be nice to open Photoshop as my editor.