I heard that Valve is/has developed a large engine update for the games running on the Source MP Engine branch (ex. DOD;S, CS:S). The update is about upgrading the engine to use VPK instead of GCF. Because to read the files/load faster than reading GCF-files. This affect all mods, plugins, skins and models. They have to be moved to an other folder. According to the article, steamapps/common/Team Fortress 2/common/addons. https://support.steampowered.com/kb_article.php?ref=7388-QPFN-2491&l=english What I caught from the text, I got worried if this would break the contents for our WIP/source versions of maps. What do you think?