'Tris to Quads' on narrow faces does nothing As the question title states I tried importing a svg file, went to Edit mode A to select ALL, and control F, selected tris to quad and it won't work. 
What am I doing wrong?

here's the blend file
Try increase the maximum angle threshold, this will give you quads, but they won't be very square.

For better results, run: Mesh -> Faces -> Beautify Faces first.