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if it is an AutoCad file it will open having used a manual save or automatic save feature.
Perhaps you are talking about backupfiles? In this case you want to read what I have copied below!
Understanding AutoCAD backup and autosave files | AutoCAD ...
https://knowledge.autodesk.com/.../autocad/.../Understanding-AutoCAD-backup-and-... Jan, - You want to know more about the backup (.bak) and autosave (.sv$) files that AutoCADcreates, ... Backup (bak) Files Automatic Save (sv$) Files Temporary (ac$) Files Drawing ... the .bak extension to dwg and then opening that file in AutoCAD. ... backup files created automatically by the Autosave feature.
I asked six questions concerning of Auto CAD.
Auto CAD program, That only is a geometric tools and the most important is the design engineer and professional creativity.
I used the program for more than fifteen years,and I can advise you to get books to explain the orders of the program or taking an educational course.
But the most important thing after learning the permanent practice.
and at Last -The most important is the engineer creative designer.
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.
