All Linux distibutions are essentially the same. They run on the same core, much the way Windows 3.1/95/98 runs on DOS and NT/2000/XP runs on... whatever it is that they run on.. lol
All Linux distro's run on the same core kernel, except with some different commands and software packages built in. Although some distro's appear and respond to commands differently, if you really know what you are doing you can essentially make your own distribution.
So, in response to your question, any Linux distro can probably run Ragnarok using WinE (Windows Emulator), but would require moderate knowledge of what you are doing or following a guide online (try googling for "ragnarok linux wine help").
In form with the rest of the posts, my favorite distro is any Debian-based distribution such as Ubuntu, Parsix, MEPIS, or Debian itself, although I am slightly partial to
MEPIS myself. MEPIS has the option (like Ubuntu and several other Debian and non-Debian distros) to run directly from a LiveCD and not require installation on your hard drive and thus can be easily run in tandem with Windows without the need for a secondary hard drive or partitions. That is a useful feature although the speed of the OS is then limited by a bottleneck in the speed of your CD/DVD-ROM drive and runs much faster when ran from a HDD (hard-disk drive)
The main advantage to Linux is that it is much more stable than Windows and is required to be free. If it is not free, the source code (programmers code) must be made freely available upon request. The only way you may profit from selling Linux is by charging for the distibution media (CD's etc.) or for support (phone, website, or book documentation), and it was designed this way by the creator of the first Linux system.
If you are serious about trying linux, check out
http://www.distrowatch.com for a top100 list of Linux distros based on HPD (hits per day), or check out
http://www.mepis.org for my favorite. If youreally think you can handle Linux and want to run it, feel free to send me a message over the forums and I will give you instructions on how to use a private members-only FTP I have access to for MEPIS.
Hope I helped in some way.
