in help,
they say lContent is always 0,

////////////////////
typedef struct {
float fMins[3]; // bounding box
float fMaxs[3]; // bounding box
long lContent; // always 0
long lNumVerts; // number of VERTEX structs that follow
long lNumTris; // number of TRIANGLE structs that follow
long lNumSkins; // number of SKIN structs that follow
} BLOCK;
/////////////////////

but i check some wmb7 file,
lContent is set -80 or -128 or 0

whats meaning of this parameter?