The latest Zeranoe xp-compatible build was ffmpeg-20150525-git-8ce564e, released on May 2015. After that, people started complaining about the following error: "The procedure entry point _wfopen_s could not be located in the dynamic link library msvcrt.dll". On the official Zeranoe FFmpeg Builds site, it says that "All builds require at least Windows 7". So, I took a look at the code and I noticed that FFmpeg code itself has not stopped being XP compatible, but the inclusion by Zeranoe of some external libs that are either themselves by default not compatible or have become incompatible at some stage of their development is what broke Zeranoe builds. Anyway, many external libraries and codecs are still compatible with XP, they just need to be tweaked correctly, just like MSYS2 did, in fact I used their project to compile ffmpeg with GCC and, as result, the build is updated and XP compatible.
FFMpeg 2017 x86 - Windows XP, WIndows Vista, Windows 7, Windows 8, Windows 8.1, WIndows 10 Compatible
https://mega.nz/#!Od9DRD5R!ynjjY9uHzLM6UYLZl5xFMxQ1gnkPZxbmcCvGr9fuAvk
Happy new year.