Microsoft File Extensions: A Complete Guide

File	Description
.jfproj	JSON Font Project File
.msixbundle	Windows 10 App Bundle
.msixupload	Windows 10 App Upload Bundle
.visio	Microsoft Visio file
.us%3F	Microsoft Word font file
.%2400	MS-DOS pipe data
.%2401	MS-DOS pipe file
.%2402	MS-DOS pipe
.%2404	MS-DOS pipe
.%24ol	MS-DOS pipe
.%24o1	MS-DOS pipe
.%2405	MS-DOS pipe file
.b%21k	Microsoft Flight Simulator scenery data
.hl%24	MS-DOS compressed help document
.pi%24	Microsoft compressed PIF program information
.emsixbundle	Encrypted MSIXBUNDLE package
.emsix	Encrypted MSIX package
.eappxbundle	Encrypted APPXBUNDLE package
.%21%40%21	Microsoft Windows backup of WIN.INI
.wa%7E	Microsoft Address Book data
.sdocx	Sealed Word Document File
.f%2Bdb	Microsoft FoxPro database
.%2403	MS-DOS pipe
.%7Ebt	Microsoft Windows update directory