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CAD tip CAD tip # 4345:

Question CAD 
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Q - question

What is the difference between .BAK, .SV$ and .AC$ backup files?

A - answer These file types are different backup and temporary files created by AutoCAD.
  • BAK files are backup files created on manual Saves (save commands) in AutoCAD (previous DWG versions)
  • SV$ files are automatic timed backups (autosave) of drawings (deleted on successful AutoCAD exit)
  • AC$ files are temporary AutoCAD working files for various functions (undo, hidden lines...), ac$ files do not contain drawing data

Some AutoCAD functions may also create .TMP files with temporary data (drawings cannot be reconstructed from these files).

ACADLTACADMADTABSMapCivil
100% *  CAD 
12.4.2005    39495x  
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See also:
Tip 11170:Be an expert in saving of drawings.
Tip 11145:AutoCAD: Customization file load failed.
Tip 11052:How to add your own chain type to the roller chain generator?
Tip 10958:Extended TCase supports accented characters and small caps.
Tip 10612:Revit error: Unable to open because of unresolved pointer references​


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