What is a APPX File Type?
When submitting Windows applications to the Microsoft Store, developers do so by packaging all files and information necessary to install the' application in an APPX or .MSIX file. They then submit the file to the Microsoft store. Every time you download and install an application from the Microsoft store, you actually install the APPX or MSIX file (which, when 'is open, installs the' application it-itself) and download it.
Microsoft introduced the Windows 8 APPX file format when the Microsoft store s' called the Windows store. Although it still supports the APPX format, the new MISX format is more common.
Typically, developers create APPX files within Microsoft Visual Studio. To create an APPX file in Visual Studio, just right-click-on your project and select Publish & &&&&&& rarr; Create App Packages.
When building an application for several processor architectures (x86, x64, ARM, etc.), developers can group several variants into a single .APPXUPLOAD or .APPXBUNDLE package. Alternatively, individual APPX or MSIX files can be submitted to the Online Store for each architecture.