I\'ve compared two files using the following code:
Compare-Object $(Get-Content c:\\user\\documents\\List1.txt) $(Get-Content c:\\user\\documents\\List2.txt)
Use the Out-File cmdlet
Out-File
Compare-Object ... | Out-File C:\filename.txt
Optionally, add -Encoding utf8 to Out-File as the default encoding is not really ideal for many uses.
-Encoding utf8