powershell filename quoting

PS C:\temp\test> dir


    Directory: C:\temp\test


Mode                LastWriteTime     Length Name
----                -------------     ------ ----
-a---        09/10/2015     13:31          0 a  [b].txt


PS C:\temp\test> foreach ($f in Get-ChildItem) { echo $f.FullName; Remove-Item -Path $f.FullName }
C:\temp\test\a  [b].txt
PS C:\temp\test> dir


    Directory: C:\temp\test


Mode                LastWriteTime     Length Name
----                -------------     ------ ----
-a---        09/10/2015     13:31          0 a  [b].txt


PS C:\temp\test>