The File Extensions Database

.CHD File Extension

  • Developer by: The MAME Team
  • Category: Game Files
  • Format: Binary

What is an .CHD file?

.CHD is MAME Hard Disk Image

Arcade game disk image used by some MAME (Multiple Arcade Machine Emulator) emulator games; stores a compressed version of the entire contents of an arcade machine's hard disk; used in conjunction with a game ROM to load the game.

To load a MAME arcade game, you typically need to place the CHD file in a directory has the same name as the ROM's filename prefix (some emulators use a single generic directory for all CHD files). For example, for a ROM with the filename, a CHD file named mygame.chd, and a ROM directory Roms, emulators commonly use the following convention:

  • /Roms/
  • /Roms/mygame/mygame.chd
Some CHD files are large in size due to the original size of the arcade hard disk. Therefore, even though CHD files are compressed, they may still require large amounts of disk space.

Programs that open MAME Hard Disk Image

How to solve problems with CHD files

  • Associate the CHD file extension with the correct application. On :
    Windows: Right click on any CHD file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CHD files". Mac: Right click (or Ctrl-click) the CHD file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CHD is MAME Hard Disk Image. Because only the current version supports the latest CHD file format. Search, therefore, e.g. on the The MAME Team manufacturer website after an available .CHD is MAME Hard Disk Image update.
  • To make sure that your CHD file is not corrupted or virus-infected, get the file again and scan it with antivirus software.