It's been a long time since I've used Windows 3.0. A really long time. While I have no desire to dump Windows 10 and go back to an earlier era of computing, I do appreciate taking a trip down memory lane every so often. If you do as well, you can take a nosedive into nostalgia by downloading the source code for Windows 3.0's File Manager.
The code is maintained by Craig Wittenberg, a development manager who has been with Microsoft for more three decades, according to his LinkedIn profile (opens in new tab). It was originally copied from the Windows NT 4 source tree in November of 2007.
So, what can you do with it? You could use the source code to compile a new Windows app for managing files like it was done in the old days. Or if you're not into compiling code, you can download WinFile v10.0 from Github (also from Wittenberg) and poke around Windows just like the old timers (myself now being one of them, I suppose) used to around two decades ago. Either way, it's pretty neat that this still works in Windows all these years later.