This might be useful, although the instruction to drop files into C:\Windows\System32 is not something I would follow.

https://github.com/hey-red/Mime/issues/9

Update: Although there is an Alien package Alien::LibMagic which will get you the DLL to link against when compiling File::LibMagic.

Update 2: ...although compilation of libmagic needs libgnurx so the Alien does not work on my Windows machine. One could develop an Alien::libgnurx but I suspect that would simply be the start of a journey down a rabbit hole of dependencies...