Halo Editing Kit (HEK)

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After installing the HEK, Windows users must prevent the Virtual Store from interfering with it.

The Halo Editing Kit or HEK is the official suite of modding tools released by Gearbox Software alongside Halo: Custom Edition in 2003. The kit consists of modified versions of Bungie's own internal development tools and includes a tutorial and commonly used data and tags for map development.