Remapping Command key to CTRL key on on Windows does not work via SharpKeys

I connect to Windows server via Apache Guacamole from my MacBook and would like my Mac's Command key to work as a Ctrl key in Windows. Otherwise each time I need to copy paste I have to do Command+C (on Mac) and then CTRL+V (on Windows). I installed SharpKeys on Windows, however the Type key feature does not detect Command key (neither Option key). So I added remap manually, and successfully write to registry, however it does not work. I am remapping Special: Left Windows (E0_58) to Special: Left Ctrl (00_1D) Any idea why is it not working?

Question by user1880405 on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.