Is it possible to have Build Forge call a putty command?

Hi, I am brand new to build forge and starting to setup our build script.  We are using build forge on a windows build machine then once the build is complete, we want to deliver our files to a unix box.  I'm able to manually run the pscp command from a command line (pscp -r -pw <password> "<Workspace path to files>" <user>@<unix server>:/<unix directory>) but when I enter the command into a build forge step, it appears to just hang and then time out.  Here's the command I'm trying to run in build forge: