Cannot connect to VMware Player from the internet (OK on LAN)

Have set up a VM running Windows 7. I can remote desktop to it from the host computer or another computer on my wireless LAN at home. But from outside the LAN I cannot get access via RDP nor ping to it.

I suspect this has nothing to do with VMPlayer itself and some setting on the host computer to allow someone outside the LAN to access the computer? Am I correct?