To Restore a Drawing From a Backup File

Change the extension of a BAK file to DWG in File Explorer.

In File Explorer, locate the backup file identified by the .bak file extension.
Right-click a file and choose Rename.
Enter a new name using the .dwg file extension.
Open the file as you would any other drawing file.

Display File Extensions in Finder

If file extensions are not displayed in Finder, you need to display them so you can edit the .bak file extension.

Switch to Finder.
Click Finder menu > Preferences.
In the Finder Preferences dialog box, Advanced tab, click Show All Filename Extensions.
Close the dialog box.

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