In MicroStation V8, auto-save writes your design changes to the file periodically. There may be instances where you open a DWG file and you do not want your work automatically saved.
When DWG files are open for editing, changes made in the DWG file are not automatically saved as they would be in the default settings for DGN files. Files must be manually saved, saved at time of closing the file, or they can be set to automatically save. In instances where you may open a DWG file to make temporary edits or no edits at all, how can the automatic save feature for DWG be invoked?
To disable the DWG autosave option:
If this configuration variable is set to zero, no auto-save is done while the DWG file is open. The file is now only automatically saved on exit or when switching to a different file.
Using The AutoSave Features In MicroStation V8 [CS]