First of all, sorry to post here, but I wanted to attach a file larger than the maximum allowed by the bug tracker. Although now I'm writing here I cannot see controls to upload a file at all.
I cannot reproduce it using a new SH3D project but I had the problem with the project I'm working on with SH3D 3.5 installed on Windows 7.
I have a copy of the file (I'll try to upload some how) on which I deleted all the content except the background image. It takes about 1.7M, since it's the size of the background image.
If you load that file, delete the background and then save the file again, the size of the file is still 1.7M. More than that, if you then add another background image and save the size of the file will be 1.7M plus the new background size.
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