C:\Matrix Games\Distant Worlds\images\effects\weapons >Is the weapons image folder.
After unzipping, choose a image you want to replace, for exp. Beam_0.png. Make a "copy" of beam_0 via "right click" mouse> copy> then paste in folder. (You should now have a duplicate weapon image. ) Right click original image file, click rename, highlight name, right click copy, then delete original image file. Extract the image you want to the above folder, rename it to "beam_0.png" Then play your game, If you don't like the image you can always choose another one, and the original one is still there, in case you mess something up.
or simply make a copy of the image you want to remake, copy the name of the original image, and then delete the original image. followed by extracting the "selected" image to the weapons folders, rename it, and try it out.
Hopefully that makes sense, I'm better at showing how to do it, then explaining it.