There are 2 file types use the .VAC file extension:
1. Oc2.316s Cakit File
Computer Algebra kit; contains a large set of classes for polynomial computing and arbitrary precision integer arithmetic.
|Portable Object Compiler or other C compiler|
Updated: March 12, 2021
2. MikuMikuDance Accessory Settings File
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.
Updated: August 27, 2011