The File Extensions Database

.APPEX File Extension

  • Developer by: Apple
  • Category: Developer Files
  • Format: Binary

What is an .APPEX file?

.APPEX is OS X Application and System Extension File

An APPEX file is an extension bundle created to add functionality to an application built in Xcode, a software development IDE used for developing iOS and OS X apps. It contains an extension which consists of code used to perform a task such as posting to a social channel from a web browser, replacing the iOS default keyboard with a custom keyboard, or providing access to and managing a repository of files. APPEX files are packaged inside their containing .APP files.

APPEX (short for app extension) files allow developers to extend the custom functionality and content beyond their app. App extensions also make the content from a developer's app available to users while they are utilizing the system or other apps. Since Apple applies limitations to the memory usage of apps, extensions are utilized to launch separately from the app to provide functionality then quit in order to save on memory use. App extensions are opened when a user selects it in a host app, which then issues a request to the extension, which receives it, assists the user in performing the task, then promptly closes after completing or cancelling the request.

Programs that open OS X Application and System Extension File
Apple Xcode

How to solve problems with APPEX files

  • Associate the APPEX file extension with the correct application. On :
    Windows: Right click on any APPEX file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.APPEX files". Mac: Right click (or Ctrl-click) the APPEX file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .APPEX is OS X Application and System Extension File. Because only the current version supports the latest APPEX file format. Search, therefore, e.g. on the Apple manufacturer website after an available .APPEX is OS X Application and System Extension File update.
  • To make sure that your APPEX file is not corrupted or virus-infected, get the file again and scan it with antivirus software.