We are trying to deliver a solution that involves including certain project files into the .mar file. We need to change file associations but cannot. Also need to rename or open the mar file to verify some things. Root cause seems to be that the .mar file extension is conflicting with the Windows 10 .mar extension for Microsoft Access Report file.
The VS .mar file extension is conflicting with the Windows 10 .mar extension for Microsoft Access Report file.
All supported DevTest Environment
If you have Microsoft Office installed, any version, and you create a file with a .mar extension, or even if you have an existing file and change its extension to .mar - it automatically turns that file into a Microsoft Access Report Shortcut file
Use the DOS prompt / Cmd prompt to change or rename the mar file
>rename *.mar *.zip