Command for accessing and Opening Folder to have access to mxd's in folder.

I am trying to open or access a folder that holds mxds. Code is below :

Dim cboStations As String
If cboStations = "Annual" Then File_Open "K:MAPPING\2012"
ElIf
cboStations = "Urban" then File_Open "K:MAPPING\URBANS\2012"

The program isn't even trying to run. So I don't have an error message.