Can't install Arial.ttf from Windows / Arial is "Arial Narrow"

I use Arch Linux, and have followed the wiki pages regarding [Fonts](https://wiki.archlinux.org/index.php/Fonts) , [Font configuration](https://wiki.archlinux.org/index.php/Font_configuration) , [Microsoft fonts](https://wiki.archlinux.org/index.php/Microsoft_fonts) and [Infinality](https://wiki.archlinux.org/index.php/Infinality) . However, it seems something is wrong with the Microsoft fonts. I copied them over from a mounted **Windows 10** installation. I first copied the fonts from C:\Windows\Fonts to another place (in Windows), as cp was giving me unsupported reparse point errors on a lot of files. I counted the number of files, there were more than 300. Using fc-cache -rv, only **217** fonts were detected. The problem is most noticable to me as Arial resolves to Arial Narrow. That looks like crap: I checked all my font config files thrice, there are no rules that substitute Arial with Arial Narrow. The Arial.TTF font is simply not installed: fc-list | grep -i 'arial' | cut -d':' -f 2,3: /usr/share/fonts/WindowsFonts/ARIALN.TTF: Arial,Arial Narrow /usr/share/fonts/WindowsFonts/ARIALNB.TTF: Arial,Arial Narrow /usr/share/fonts/WindowsFonts/ARIALNI.TTF: Arial,Arial Narrow /usr/share/fonts/WindowsFonts/ARIALNBI.TTF: Arial,Arial Narrow /usr/share/fonts/WindowsFonts/ARLRDBD.TTF: Arial Rounded MT Bold /usr/share/fonts/WindowsFonts/ARIALUNI.TTF: Arial Unicode MS fc-match arial: ARIALN.TTF: "Arial" "Narrow" I managed to do it in the past with **Windows 8**. Could that be the reason (Windows 10 now)? Update = It gets even more crazy. I've copied fonts from Windows 8 now and rebuilt the cache. Arial appears to be installed and works in a few applications **except Firefox**. It renders Arial as completely blank!