.ACA File Extension
File TypeAgent Character Animation File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an ACA 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.