sshwindows and scp protocol

I'm unable to connect to my sshwindows server using the scp protocol in winscp. Sftp works fine but not scp. I'd prefer to get scp working if I could as I get about 2x the speed with it. Is there somewhere that documents the settings to use with a default sshwindows server? I've already tried changing the shell on the scp tab to /bin/sh (the only shell I could find on the sshwindows installation) but when I tried to connect I got an error that said something like it couldn't run a "groups" command. Any help is appreciated.

TIA

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