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Below you see the list of file formats for ArmA.
8WVR - terrain file format.
OPRW - OPRW v17, v18 and v20.
P3D - ODOL - 3D model file format.
P3D - MLOD / P3DM - 3D model file format.
Paa - PAA texture format.
POSE v60 - terrain file format.
PEW - Visitor 3 project file format.