Also, you can use the Windows AIK to make a WinPE image, copy the MSTSC.exe (et al) files from a Windows 7 computer into the image and use that. It can be PXE booted, live or RAM / CD or USB, installed to a HD.
The required files (relative to %systemroot%\System32) are:
Note: The reference computer the files are copied from must match the version of WinPE you're creating, 32-bit or 64-bit. 64-bit WinPE has no ability to run 32-bit programs and vice-versa.
You may also want to include setres, a free program to set the resolution from the command line/scripts/etc. The WinPE default is 800x600 with no built-in way to change it.