With the Halo: Reach launch imminent, players have been posting their lingering questions to the official Halo Reddit, and one of the queries raised included whether Halo: Reach on PC will launch with mod support. A 343 Industries employee replied, confirming the team is working on improving mod support – but at the moment it can only be done in a roundabout way.
“Hi! We’re still working to improve this down the road, but for now you will have an option when you launch to bypass anticheat. This will allow you to play around with campaign and customs but not allow you to play any match made games.” said employee 343_farn.
Source: IGN.com Halo: Reach For PC Will Launch With Unofficial Mod Support