Hi, get him to save the XRR skins found here:
http://www.lfsforum.net/showthread.php?p=1012#post1012
Save the skin in LFS/data/skins folder (not any of the other skins folders).
After you save the skin, if you open the LFS/data/skins folder - can't you find the saved .jpg skin file? That's quite odd.
Where is LFS installed? Under Window's Program files? Its recommended that you install LFS directly - i.e. C:\LFS
The viewer is a separate program (it has its own data folder), so don't extract/install the viewer inside the LFS folder. Try saving the above skin file in the Viewer's data/skins folder and then open the skin.
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If you have more than 1 LFS installation in your computer make sure that you're saving the skin in the correct folder (some people save the skin in one LFS installation's data folder and then launch another LFS installation's LFS.exe and then complain the skins don't work...).
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Also, if the skins don't disappear after you save them (after you save them, look in LFS/data/skins to see if the saved XRR .jpg skin file is there), select the XRR in pits and then select the "new colours" from under the skin-file-list. Skin files that you save, HAVE to be opened for the first time clicking on "new colours" and then selecting the new XRR file from the list... Just saying if your friend didn't know that... (saved files dont automatically appear in the garage screen - skins list).
Hope that helped.