.VAC File Extension
File Type 1Oc2.316s Cakit File
What is a VAC file?
Computer Algebra kit; contains a large set of classes for polynomial computing and arbitrary precision integer arithmetic.
File Type 2MikuMikuDance Accessory Settings File
.VAC File Association 2
3D model file used by MikuMikuDance, a modeling program and music and dance synchronization game; contains coordinate and rotation settings for a 3D model accessory (.X file), such as clothing or hair; used for automatically placing accessories on a 3D model.