exporter script changes the mode of selection of Blender?

After I exported a cube into .sio2 with SIO2's exporter python script, the mode of selection of Blender changed. That is, in a cube, I could not select the whole square as a face, instead I could only select one triangle that is half of the square. Please tell me how to get back the original way to select the whole square as a face? Thanks so much.

And sorry for my poor English.

Hi, what language go you speak? i speak Spanish.

About your question, you should save a backup copy of your models before export, the exporter triangulate everything to export, as far as i know there is no way to reverse this, you can do it by hand but is a tedious process, the best way is keep your original file safe.

Convert triangles to quads?

SIO2 knows. in 3D view select all faces, then go to mesh -> faces -> convert triangles to quads or press ALT + J with all faces selected.

Yeah, ``convert triangles to quads'' works. Thank you all.