broked.ps1

mkdir 1; mkdir 2; 
new-item 1\FILENAME.txt; new-item 2\FILENAME.txt; 
ls *\FILENAME.txt | Select -Exp Fullname ; 
ls *\FILENAME.txt | sort -desc Fullname | Select -Exp Fullname ;
ls *\FILENAME.txt | sort -desc fullname | Sort Name | Select -Exp Fullname

# You can do this without the Select -Exp Fullname, but this is easier to see what its doing. 


Another test:


$Data = "Fullname,Name
one\FILENAME.txt,FILENAME.txt
two\FILENAME.txt,FILENAME.txt" -split "`n" | ConvertFrom-Csv

$Data 
$Data | Sort -Desc Fullname
$Data | Sort -Desc Fullname | Sort Name