RDS??? Remote Desktop Services ??? If so, NO, this isn't "Windows" you get on a PC, this is Windows CE, which is specifically coded to work on 'locked' devices like PalmPilots (of old) or very old netbooks, to just do the things it is setup for by the manufacturer and nothing more (there is no 'Windows CE' software you can just download/buy).
As for 3G, that is a list of specific hardware devices that speak in a particular way, first off being the User Interface would let you 'set up' the hardware with the LIMITED list it supports, so a Wifi Adapter wouldn't be on that list. Second the setup would include (normally) the account information and such you need to 'input' into the settings to connect to a 3G service (be it a telephone number, acct code, whatever it is for that Cellular service). Being as this is a IMPORT I will HIGH BET it is designed for the Asian Cell Services ONLY, which is NOT ATT, MCI, Sprint, etc. here in the States.
So again it wouldn't know how to 'use' a wifi adapter because it's logic steps are, "I need to provide xyz info for device to connect to service ABC when enabling 3G", not a "let me enable device then scan for Wifi spots to connect to, ask user to connect to wifi spot via console UI". Different programming completely.