I had this problem to once. The fix is easy, thoguh time consuming. All you have to do is go into your steam games tab and right click on SH3 and select deleat local content. Once that is done go to the directory where your steam stuff is, useualy it is some thing like C:Program files\ steam\ steam aps\ common\. If you find any trace of SH3 there delete it, back up an mod down loads if they are stored there if you want them for later. Then go to your My Documents folder and find the SH3 directory there, should be right in My Documents no need to hunt thru subfolders. Back up anything you want to keep, campain saves and such. After you do all this there is no trace of SH3 in any steam directory or directory they create. Re-down load the game from steam and install GWX3 and then put back any backed up files that you wanted to keep.
If there is a simpler or faster way of doing it I don't know what it is, but that way worked for me.
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