blitz3d is just a programming language! you cannot use it to open/import/export or edit models. its not a model editor or viewer! impossible if you do not program with blitz3d.
This isn't Blitz3D itself.
It's obviously some program written in this language.
You can write 3D-Modeler in BlitBasic, but neither the IDE nor the Compiler are able to do such things.
Can i open the 3d files of stranded 2 in "Blender"?
afair not.
A Program called biturn can convert b3d-Files into some other formats, but without animation.
There also exists an import-plugin/pipe for 3ds max somewhere.