Read username from registry and set it as variable

New-Variable -name UserNameAppV -Value (Get-ItemProperty 'HKCU:\Volatile Environment' | Select-Object -ExpandProperty UserName);New-Item -path Registry::'HKCU\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers' -Force;New-ItemProperty Registry::'HKCU\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers' -Name $("C:\Users\" + $UserNameAppV  + "\AppData\Local\Microsoft\AppV\Client\Integration\798F4668-A3EF-4849-A9D8-1933241DC39C\Root\Adobe Photoshop CS5\Photoshop.exe") -Value RUNASADMIN -PropertyType 'String'

Usage: http://ittechlog.wordpress.com/2013/10/11/virtualize-adobe-photoshop-cs5-using-microsoft-app-v-5-0/