Acts a bit differently on Windows than Linux. On Windows the file menu includes the Open option. The "Open" item will send the image to whatever graphics editor is your default. For instance, if images are set to open with photoshop, then photoshop will open with the currently active image.
On Linux WPClipper will look for specific image editors on your PC. If it finds Gimp, the menu will include an Edit w/Gimp. The same applies for XV and ImageMagick. If you don't have them on your machine, they will not show up in the menu.
Below is a shot of the File Menu on Linux.
