The AMCONVDWG command uses CCF files to convert a drawing from one format to another.
The path to the folder containing parts list files is in the system editor key Acad/M
PathsConv (Configuration file settings gef@Paths@Conv).
By default, the key points to C:\Users\Public\Public Documents\Autodesk\AutoCAD Mechanical 2025\Acadm\Gen\Conv