A WOTMOD file is a game modification file used by Wargaming.net World of Tanks, a free online tank battle game for Windows and macOS. It is used to modify gameplay, such as tanks, weapons, and gun sights. WOTMOD files contain multiple files, such as .DDS and .PDN files, in a Zip-compressed archive.
WOTMOD files will most likely only be seen by World of Tanks users looking to modify aspects of gameplay. The files are often downloaded from a World of Tanks community site then placed in the "mods" folder of the game installation directory in order to take effect in the game.
Since the files are simply renamed .ZIP files, users can extract the contents in WOTMOD files using Zip decompression programs, such as 7-Zip, WinRAR, or Apple Archive Utility. To do this, rename the ".wotmod" extension to ".zip" and decompress the archive.