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The program works quite well, and just has one icon. It essentially lets you choose a folder that has your pictures, and lets you choose the timed or random intervals of what your wall paper will be.
http://sourceforge.net/projects/wpchanger/
It is posted on Sourceforge, which I think does that mean it is open source. It has the GNU General Public License (GPL) as it's license.
I am not sure if it is the smallest file size, but it is one that works.
Unfortunately it requires .NET so it isn't portable.
where did it say that? I believe you, but I was trying to read all that I could so it would be a good canidate. 
Well, I made my suggestion before the other Wallpaper Switcher was suggested so hopefully that'll be what I can use.
The site says it needs .NET, but all the source code is .cpp and .h files which are standard c++ (not .NET). I think they used one of the newer windows compilers that can compile .NET, but no actual .NET code is used.
Then the test would be to run it on a machine that does not have .Net installed correct ?
Tim
Maybe this could be integrated into the CAFE mod and PortableFileassociater.
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