hammer fails to open maps

Hey FacePunch

Is anyone else having problems opening map files in hammer every time I open hammer I get an error “Can’t load FileSystemOpenDialog.dll” and when I try to open a map hammer will close with out an error message or any indication any thing is wrong this has started since the Engine update I have tried all the other game settings i.e. Counter-Strike: Source but it is the same problem.

Literally seconds on google.