Halo Editing Kit (2004)

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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. 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.

In 2021, the HEK was updated and rereleased as the H1A Editing Kit.