AutoCAD autosave files (.$ac) are only created in the software and it's not exactly a file conversion per se. If you enable the function in AutoCAD, these files be generated in periodic intervals or based on other settings, you do not have to look for a special software in order to convert to these files whatsoever.
Home > Search converters: step to $ac
Conversion of step file format to $ac file format beta
Search for step to $ac converter or software able to handle these file types.
Convert ISO-10303 STEP product data file to Autodesk AutoCAD autosave.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: step file extension details, $ac file extension details
STEP
Files with step extension are quite often found as 3D model / part files saved in STEP (Standard for the Exchange of Product Data) format.
$AC
An $ac file extension is related to the Autodesk AutoCAD modeling utility. An $ac file stores CAD drawing saved by the autosave function.
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