.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 a 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.