PS: (Win8 Pinning) Detect & Pin Application to metro

Hi

Can someone Help me script the below (Have very limited Powershell knowledge), basically I want to use a GPO to run script at login to pin icons to win8 start menu, found the below script

http://gallery.technet.microsoft.com/scriptcenter/Script-to-pin-items-to-51be533c

Detect Compliance Script:

Need some help with this one, im guessing somehow detect non existance of file EXCEL.EXE in this location: C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Microsoft Excel and then If this doesnt exist run the below remediation:

Remediation Script:

import-module C:\Scripts\PS\PinItemToStartMenu\PinItemToStartMenu.ps1
Set-OSCPin -Path "C:\Program Files\Microsoft Office\Office15\EXCEL.EXE"
Rename-Item "C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\EXCEL.lnk" "Microsoft Excel 2013.lnk"

Can someone help with the Remediation script so it can handle multiple file paths in a string\txt file so it doesnt have the above repeated each line for each icon to be pinned? As will want to do this for word, excel, powerpoint etc