A console is saved in a file with an .msc extension.
A console is saved in a file with an .msc file extention, and a snap-in in a console can itself be a console.
certmgr.msc
A compiled Help File in Windows will have the extension .chp
*.msi is the extension for the Microsoft installer package.
Windows applications in general (not just for Windows 3.1) automatically append the file extension.
file extension
File Extension
.doc
The filename and extension of the file you want to start and .msc (eventvwr.msc)
The file name extension of clip art in Windows Clip Organizer is .jpg (JPEG).
Unix audio file.
.doc