Silo Format
Supported 3D file loading formats are *.sib, *.sia, *.obj, *.3ds, and *.dxf.

Supported 3D file saving formats are *.sib, *.sia, *.obj, *.3ds, *.dxf, *.stl, *.rib, and *.pov.

So you can use OBJ or DXF for import something inside MOi

Must be better if you want make some SUdivision inside Moi to have surface OBJ Object "quadrangulated" !
Then 2 methods : _ImportObj script by Max Smirnov : you can regulate the % of Subdivision 0 to 100
or the native SUbD / Create from File: you will obtain an object subdivided so with rounded forms!

You can also use "obj23dm" for have only the wire obj structure