Dying Light's new PC patch has prevented mods from working, but developer Techland says this was not the intention.
Patch notes for Update 1.2.1 state that the aim was to "block cheating by changing the game's data files". However, it seems the game's ods were also targeted.
In an update on the game's Steam forums, Techland commented:
"With the recent patch (1.2.1) on Steam we blocked cheating to make sure the game’s PvP system (Be The Zombie) would not be abused. This, however, had the side-effect of hindering mod-makers from making changes to the game.
"Creating obstacles for modders has never been our intention, and we are sorry for the inconvenience. We are now working on a quick patch that will re-enable common tweaks while stopping cheating in the game’s multiplayer mode."
Techland added that "we have been working, and still are, on giving modders all the power we can." The developer also promised to keep players updated.
The patch was released after players managed to disable the game's always-active film grain effect via a tiny 523-byte file, which was then shared on sites including MediaFire and TinyUpload. The file has since been removed as a result of an anti-piracy claim from U.S. games industry body the Electronic Software Association (ESA) under the Digital Millennium Copyright Act (DMCA).
