An HQM file is a data file used by Minecraft with the Hardcore Questing Mode mod. It stores quest data, which includes the map of the quest, number of lives, and rewards achieved. HQM files are generated when you install the Hardcore Questing Mode mod to Minecraft and begin a quest.

Minecraft is a popular cross-platform game where you can break and place blocks in order to build structures and explore the virtual world. Because of its popularity, a variety of users have developed mods to alter the gameplay of Minecraft. The Hardcore Questing Mode mod allows you to play in multiplayer hardcore mode in Minecraft but with more than just 1 life, which keeps your world from being deleted and protects you from getting banned from a server when you die.