You know, if it doesn't save the extension, you can just renamed it and thus add the extention yourself. That works just fine, so it isn't "all lost" in case you forgot to give it an extension in the save dialog (if that's what you meant, I'm not sure)
@Jesusauriusrex: How big landscapes can it handle and with how big textures which repeat how many times?
The reason I'm asking is because I'm making my own level editor, in which the landscape works just fine up to about 75x75 tiles with 256x256px textures, but then it gets rather slow. It would be nice if I could trim it up to handle terrains of around 150x150 segments or so, so that I could create vast fields with it as well.
"I kören hörs de brummande busarna Björnligan och Gondolen"