Blender: How do I combine two meshes from different files?

[ShadowsfeaR]

Hey guys, I need to know how to get one file's mesh onto another file's in Blender (e.g. get already made blockhead hands onto a weapon I've already made thats on another file itself). It would really help, thanks.

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[Cyanian]

What I do is export the minifig file into an .obj then import it into the file you want it on.