No matter where you got it, a sound file in .MP3 format is still in .MP3 format, and a player that will use .MP3 will play it. If you get music in .WMA or .WAV format and want to play it on an iPod, you'll have to first convert the file to .MP3 format. This is an extra step, but you can easily do it with utilities you can download off the Web, such as AudioGrabber.
If you store music on a Windows PC, you should be able to just drag and drop it to your non-Apple player, you just need to designate the player as a device drive from your PC. As to using a Win98PC, I think that there may be an issue with the ports; lots of Win98 machines didn't have MSB ports, and none of the digital music players on the market now will still have serial port interfaces. If you've got the MSB port, you should be able to get a Win98 machine to transfer the files, though odds are it will be a s-l-o-w process, and you may need to add a device driver to make it work.
We have two SanDisk players, a 4gb for me, and a 256mb for DS8. They work on 1
AAA battery, which gives 14 hrs play time, and you can use rechargeables. These players also function as thumbdrives, can be used as voice recorders, and have an FM radio, and they are MUCH cheaper than comparable ipods. We can pack a lot more onto them by using .wma format rather than .mp3, the compression is greater. Oh, you can organize the files in albums, too; none of that random-play-only nonsense.