The File Extensions Database

.ACA File Extension

  • Developer by: Microsoft
  • Category: Data Files

What is an .ACA file?

.ACA is Agent Character Animation File

Animation file created for Microsoft Agent, an interactive character animation technology developed by Microsoft; contains animation data that defines how the character moves and speaks; saved along with a corresponding .ACF file, which contains the character data.

NOTE: Microsoft Agent has been discontinued with the release of Windows 7.

Programs that open Agent Character Animation File
Microsoft Agent
Microsoft Agent Character Editor

How to solve problems with ACA files

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