PS C:\Users\username> dir q.w


    Directory: C:\Users\username


Mode                LastWriteTime     Length Name
----                -------------     ------ ----
-a---        12/30/2013  10:54 AM        129 q.w


PS C:\Users\username> Get-ChildItem . | Where-Object { $_Name -match 'q.w' }
PS C:\Users\username>