Variable TrnNWN2WalkmeshPayload.Header.aswm_version

ASWM version. NWN2Toolset generates version 0x6c, but some NWN2 official campaign files are between 0x69 and 0x6c.

struct TrnNWN2WalkmeshPayload.Header
{
  // ...
  uint aswm_version ;
  // ...
}