I've now done a byte-wise comparison of the before and after skp files from the previous post. The PNG files are near the beginning of the SKP file. In fact, there are two of them in each skp file, both the same size as the icon (400x361 for the uploaded then downloaded skp, 128x115 for the original). So, a fix seems possible if improbable.

The larger 400 pixel wide icon isn't just on the website, but attached to the skp file even after its downloaded. I can clear the thumbnail cache, and when Mystic Thumbs rebuilds it, I get the larger icon on the downloaded skp file (until I edit it and Sketchup regenerates the 128p png). Is there a way to attach the 2d export to a skp file without uploading it? As a sample, I took a file I made, uploaded it to the 3D Warehouse and then downloaded it back to my computer. The icon is now 400x361 wide, but I don't wish to do that all the time just to get a bigger icon.

I've done a bit of searching, and found that the embedded png for skp files is max 128x128. However, when I save a file from the 3D warehouse, the file has a much larger icon, with a max dimension of 400 (until I make a change). Is there a way to have a larger icon for the skp file?

My setup: Sketchup 8.0.11752, Windows 7 64-bit, Mystic Thumbs 2.7.8.