DRM-free game storefront GOG, per the original announcement blog post, recently announced a new "Preservation Program" for retro PC games that will be maintained for and playable on modern platforms. Any game in this program is considered a "Good Old Game" preserved by GOG, and GOG is largely dedicating its own resources to maintaining many of these long-abandoned titles.
The goal is to ensure that "this version is the best and most complete available anywhere, including compatibility, manuals, and other bonus content, but also DLCs and even features not present in other editions" and that you can "expect it to work on current and future popular PC configurations." GOG will even provide technical support for these games, should it still be needed, and add modern gamepad support, where applicable.
