It can't be called problem that is totally on the Geany side, because something is definitely wrong with the file, but still, less and cat can read it and micro can read and edit it. Geany at first can't open the file at all.
One of the things that are wrong is that the file does not end with a newline, but usually that is not a problem for Geany, something else is the matter, but I don't know what. When I add a newline in the end with micro, Geany is able to open the file but the contents are mojibake (actually it should be ASCII). If I then use File -> Reload as, and choose UTF-8 or Without encoding, Geany displays the content correctly, but only down to the 909th line, then the file is cut off, while actually it consists of 1264 lines + the end newline.
[Haldar's Mods Pack.txt](https://github.com/geany/geany/files/1528331/Haldar.s.Mods.Pack.txt)