Anytime I try and open a code file in SourceTree (running on Windows 8.1) I get an Error Encountered Dialog with the message:
'Open file <filename>' failed with code -1:
System.ComponentModel.Win32Exception: Class not registered
Needless to say it doesn't open the file. Is there a solution to this. FWIW, I am running this on an x64 version of Windows 8.1 and the SourceTree version I have is 1.8.3.0