APPX file extension is a format that is helpful in installing and distributing middleware and application software in Windows 8. The files are capable to transform the XAP file format on all Windows Phone, ranging from version 8.1 and onwards so that distribution of programs can be made unified.
APPX files can be easily downloaded through Windows Marketplace on the SC cards that ultimately require users to manually install them. APPX files are only designed for Window 8.1 and versions after it so it is useless for Mac or Lunix users. The file extension is meant for software developers since it is capability to store heavy applications and programs. Though, to use APPX file extension, developers must possess some technical skills and learn how to solve the arising problems.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .APPX file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .APPX file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .APPX file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.