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Super late addition, but just in case others are having this problem :
It's possible in Windows to use PowerShell to batch rename files.  In this example, you'd want something like...

Get-ChildItem | Foreach-Object{     Rename-Item -Path $_.FullName -NewName $_.Name.Replace(" Default","-Default") }

or possibly just

Get-ChildItem | Foreach-Object{     Rename-Item -Path $_.FullName -NewName $_.Name.Replace(" ","-") }  

There are a couple of ways to do it - google/duckduckgo for Powershell batch rename' and look at the stackoverflow website entries, that's where most of the good stuff is at.