You need to have some important preferences if TTF export of Corel should work:
1. Page size 750 x 750 points (not pica!)
2. Place a letter of an installed font (Arial, Times...) on this page. Give this letter the size of 720 points and draw some guides on its baseline and height.
3. Delete the letter of point 2.
4. Your new letter (= your logo) should have the size of about 720 points. The export filter of Corel works only with this size. If you try to change it in the following window you'll get garbage. This means that you have to scale your logo to the guides you have drawn under point 2.
5. Your logo must be one single curve. No group, not 2 or more objects - no: Just one single curve.
6. Now export the new font.
7. Tip: Don't use spacebar in font name. Some Corel versions make big problems with that.
All in all the Corel export filter does its job. Of course it's not Fontographer or FontLab - but it works.