Unhandled exception thrown adding file/line breakpoint

[whitty]

With VS2010 Express C++

c:\SVN\Release6.1_GJW>vstool breakpoint foo.exe path/to/code.cpp:34
C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/lib/vstool/dte.rb:129:in add_breakpoint': Unable to determine format of 'test\tests_all.cpp', and no format specified (ArgumentError) from C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/lib/vstool/commands.rb:258:inrun_dte'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/lib/vstool/command.rb:97:in run_project' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/lib/vstool/command.rb:62:inrun'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/bin/vstool:101:in block (3 levels) in <top (required)>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/gw_command-0.8/lib/gw_command/toplevel.rb:276:incall'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/gw_command-0.8/lib/gw_command/toplevel.rb:276:in run' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/gw_command-0.8/lib/gw_command/toplevel.rb:228:indefault_command'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/gw_command-0.8/lib/gw_command/toplevel.rb:169:in dispatch_command' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/gw_command-0.8/lib/gw_command/toplevel.rb:118:inparse'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/vstool-0.3/bin/vstool:195:in <top (required)>' from C:/Ruby193/bin/vstool:23:inload'
from C:/Ruby193/bin/vstool:23:in `

'