.chd files are associated with MAME (Multiple Arcade Machine Emulator), an emulator for arcade games. However, in the context of console games like "Metal Gear Solid" for the PlayStation, a .chd file could be a part of a disc image used for emulation or archival purposes.
A CHD file compresses the entire disc image (including subchannel data, which is vital for anti-piracy checks in games like Metal Gear Solid ) into a single, compact file. Download Metal Gear Solid -Europe- -Disc 1-.chd
If you are using European hardware or specific localized save files, this is the version you need. How to Use the Downloaded File If you are using European hardware or specific
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