This is even more relevant to Digimon. I have no idea of whether their file format is supported, or how digiworld differs on OS's. I'd have to guess it's some type of web protocol? Dunno...
Edit: dug back into my childhood, the Digiworld is stored on a cluster of servers, so those are pretty likely going to be some flavor of linux. Local PC client applications are used for storing Digimon locally IIRC, and we also see in this clip that it appears that the guys are using windows 95 or something similar.