Why I need to Map a Drive before remotely checking files

Hi

I've written a command to output file versions on remote servers fine:-

$filepathname=\\10.1.2.3\c$\program files\server module\install.exe"
((Get-ChildItem $filepathname).VersionInfo).FileVersion 

However, in order for the command to work, I find that I have to map a drive to the remote machine first, which is just a bit annoying.

Even if I closed down the mapped folder, it carries on working.

Does anyone know a way around that or if I need a powerscript command to map a drive first? Seems a bit strange. Is it because I am using c$ or something?

Cheers

Matt