If you're talking about [name].blend files in Sauer it's not possible. Sauer only supports the following 3d formats: MD2, MD3, MD5, IQM, SMD, & OBJ. OBJ is the only format defaulted in Blender, (file-> export-> obj format) the others you'll need plugins for.
До свидания и заткнись
-P

http://cubeengine.com/wiki/Blender_to_MD5_to_Sauerbraten
thats what you need
http://cubeengine.com/wiki/Blender_Animated_Md3_Export
that is the md3 reference that they mention in the wiki page

Most this stuff is super old and hard to follow.

If you are just importing non animated models (like mapmodels) i suggest using the object files this is much easier to deal with.

also look at the model ref on how to define the tris and the textures:
http://sauerbraten.org/docs/models.html#obj_format

the eaest thing is just to create a folder in side of models
then put the model and the textures in it
then create a new text file chaning the extention to .cfg, and naming it model.cfg
then just type the commands you want to use inside

if you have any questions search quadropolis theres about 30000000000 tutorials on this

chasester

You can also use an IQM exporer written for Blender
https://github.com/lsalzman/iqm