Its recommended not to use it.
Quote from the author:
Code:
* collision map extractor will extract models, model instances and create model index now (NOTE: NO WMO SUPPORT YET!)
* (w000t) collision system in core. at the moment loading/unloading is enabled. THIS IS HIGHLY EXPERIMENTAL, EXPECT PROBLEMS! enable by uncommenting the COLLISION define in StdAfx.h. this is only supported under vs2003 at the moment, in the future as more progress is made future progress is made other platforms will be enabled.