A.D Cop (the game is it tech 1?)

[RaVeN-05]

https://www.mobygames.com/game/ad-cop

i looked into ADCOP.GAD and it looks very similar to WAD file

it contains maps in doom name files

sorry a little buggy here
"E1M1 Ü NULTHINGÜ ¢ LINEDEFS»ï VO SIDEDEFS? P VERTEXESaC H! SEGS ©d SSECTORSÁg Œ NODES M} ¸ SECTORS … Ò REJECT ׇ ¬ BLOCKMAPƒ GADTHINGš @ PATHS ÏŸ CAMERAS çŸ CAMERALKíŸ LIGHTDEF  LIGHTLNK  > LINEDEF1I¹ ˆ SECTORS1Ñ¿ ô SCRIPTS Å? VERSION1Å@ @ VERSION A NULLDATA
A "

[Redneckerz]

That is because A.D.Cop expands on the Doom mapping format (WAD) whilst likely using its own renderer.

You can actually play the levels in ZDoom i believe.