The File Extensions Database

.ADDIN File Extension

  • Developer by: Microsoft
  • Category: Developer Files
  • Format: XML

What is an .ADDIN file?

.ADDIN is Visual Studio Add-in Definition File

Add-in definition file created by Microsoft Visual Studio, a Windows software development IDE; generated automatically when a new add-in project is created using the Add-In Wizard; contains data used to display the add-in information when using Visual Studio's Add-In Manager component.

ADDIN files are required in order to register new add-ins in the Add-In Manager. They are typically saved in the folder that was created for the add-in project. ADDIN files are saved using XML formatting.

Programs that open Visual Studio Add-in Definition File
Microsoft Visual Studio 2017

How to solve problems with ADDIN files

  • Associate the ADDIN file extension with the correct application. On :
    Windows: Right click on any ADDIN file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ADDIN files". Mac: Right click (or Ctrl-click) the ADDIN 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 .ADDIN is Visual Studio Add-in Definition File. Because only the current version supports the latest ADDIN file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .ADDIN is Visual Studio Add-in Definition File update.
  • To make sure that your ADDIN file is not corrupted or virus-infected, get the file again and scan it with antivirus software.