How you can open a drawing file that was created with the automatic save features?

Autocad files have an extension of “.dwg” and will only open those files having this extension.

To open the drawing files you have to rename it, by using Explorer or DOS prompt you can do

that. If you are using EXPLORER you have to make sure that the option of “Hide file extensions

for known file types” is not enabled. After the file is copied you can rename and use the OPEN

command in Autocad to open the drawing.

AutoCAD will only open drawing files that have the file extension ".dwg. Rename the drawing using Explorer or do this at a DOS prompt. If using Explorer, you will need to be sure the option "Hide file extensions for known file types" is not enabled. This option is found under the View pull-down menu under Options.

Once the file has been copied or renamed, use the OPEN command in AutoCAD to open the drawing.

just rename it from *.bak to *.dwg