drisos m8,

the default key for taking sreenies in STW is F2.
Every time you press F2 one Screenshot will be placed under
Shogun/Tgas/ in .tga format, in the dimension of your screen (1024*768).

Another way is to use the clipboard function of windows. Any time you copy something with ctrl+c you copy it to the clipboard, a virtual space. To use the clipboard to take screenies I press "Printscreen" on the Keyboard. However this may vary as you can read above. When pressing "Prntscrn" the whole image on the monitor is copied to the clipboard. You now have to paste (ctrl+v) it into a graphic application such as paint. Try it while looking at your desktop to see if it works.

R'as