Trouble making files in Windows folder lowercase

Use PowerShell and check that your $files var contains all of the files

#Append -recurse if you want to go recursively, you can also adjust the filter - it gets a list of File objects that match the criteria you set
$files = gci 'C:WhateverDirectory' -filter '*.*' -File
#This loops through all of the files in $files and renames them.
$files | % {Rename-Item $_ -newname $_.Name.ToLower()}

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