If you have a large bitmap it can greatly increase the size of the file.
You can test this by Cutting the bitmaps to the Clipboard and saving the file to see how much its size decreased. The difference will be the space used for the bitmaps.
When you are in the Save or Save As Dialog, click the Options button and there you can enable File Compression. It can reduce the file to as little as 20% of its original size.
By Drawing Section I meant Sections set to be Drawings, not Auto-rebuilt Sections or Manual Rebuilt Sections. In that case all model lines are converted into 2D elements why may also increase file size.
So the file is a Master File with buildings as Hotlinked Modules. Well, that explains some of it.
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