Files that contain the .acs file extension are most commonly associated with older versions of the Microsoft Windows operating system. These files contain Agent character files, similar to the Microsoft Bob files that first introduced interactive application characters.
The ACS files are associated with the Windows OS Microsoft Agent feature, which has now been discontinued. These files contain animated characters that were created with the Microsoft Agent tool.
Microsoft Agent was a technology that was developed by Microsoft. The Agent application allowed for animated characters that were compatible with text-to-speech engines and speech recognition software. The software was a pre-installed component of the Microsoft 2000 operating system.
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