.??$ is MsCompress archive
Key Features: .??$ File Extension
|Category||Archive and compressed|
What is an .??$ file?
The ??$ file extension is related to the MsCompress program.
Compressed archive files created using MsCompress for Windows. MsCompress is a Microsoft "compress.exe/expand.exe" compatible (de)compressor.
Seems to be obsolete product.
This ??$ file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.