.SV$ File Extension
File TypeAutoCAD Automated Backup File
What is an SV$ file?
Backup file created by AutoCAD 2D and 3D design software; stores a backup of the current working design (.DWG file) and is created automatically by the software; automatically deleted when the software successfully shuts down.
SV$ files can be "converted" to a DWG file simply by renaming the file extension from ".sv$" to ".dwg."
NOTE: SV$ files differ from .BAK files, which are manual backups created when using the Save command.