What is a ZTMP file?
A .ZTMP file is a Steam Compressed Game Resource File used by Valve and its Source Engine. Multiplayer games like Garry's Mod download these files from custom community servers. The files hold game assets like maps, 3D models, or textures. To save bandwidth and speed up downloads, servers compress these files into the .ZTMP format. Most .ZTMP files use standard BZ2 (Bzip2) compression, though older files might use LZSS compression.
How to open ZTMP files?
Usually, games built on the Source Engine automatically decompress .ZTMP files during the multiplayer download process. If you download them manually and need to inspect them, standard archive tools like 7-Zip or WinRAR can often extract the internal BZ2 contents. The 3D modeling tool ZModeler also creates .ZTMP files to store temporary project data.
Summary
viewer.online/ztmp analyzes .ZTMP files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. Because most .ZTMP files use the known BZ2 format, viewer.online/ztmp can safely open and display them online, eliminating compatibility problems. If .ZTMP has multiple possible meanings, we recommend using viewer.online/ztmp to identify the actual format of the user's file.