.BMZ File Extension
File Type 1Portal Bonus Map Zip File
What is a BMZ file?
Game map created for Portal, a first-person 3D puzzle-solving game; stores a bonus map, which can be created by third-party community developers; stores a .ZIP archive of .BSP (map), .TGA (logo), and .BNS (script) files.
Portal bonus maps can be installed by opening Portal, selecting "Bonus Maps," clicking "Import Bonus Maps...," and then choosing the BMZ file.
File Type 2Compressed Bitmap Image
.BMZ File Association 2
Bitmap image (.BMP) compressed with .ZIP or .GZ compression; used for reducing the size of bitmap images for archival or transmission over the Internet; can be decompressed with many standard file decompression utilities to retrieve the original BMP file.