I've took a look at the .sys file itself.
The one from my Atheros' WiFi card is designed with 9x in mind, the Realtek USB WiFi one is not.
I'm afraid there will be no drivers for your USB WiFi dongle.
Code 2 in non-Win9x Network drivers means no luck, the VXD of Win98SE does not understand the SYS file, sorry.
In the future, try to find out the device ID of the device before you buy it. Then, check if the drivers are available. In this way, you won't waste time. That's how I knew what WiFi card to buy for my ThinkPad. Just a tip from experience