I have experienced a significant increase or change in file size when i open a .DWG file onto Map3D 2005. Without doing anything to it, I save the file and close it. THe file size is significantly changed, most of the time it increased by up to 40%.
This happens randomly to some of the .dwg files. Most of the files were created with AutoCAD2005 or Map3D 2005. When dealing with file sizes up to 10MB, a 40% increase in size each time i open and save the file is serious.