Header
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The Header is the first 12 bytes of any WAD. it contains the basic information needed to read in the Directory
- 4 bytes: MUST be either "IWAD" or "PWAD". "IWAD" is only for commercial or registered versions. "PWAD" is for Patch WADs that can be distributed.
- 4 bytes: long integer that is the number of Lumps in the wad.
- 4 bytes: long integer equal to the file offset to the directory