Font Constructor Documentation
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You can save your font as a .fb file, which consists of a UFO of your elements and an XML file with all the transformations of the elements in your font.
Font Constructor allows to generate UFO's of your constructed font, in case you want to open your result in Fontlab or in any other application that supports UFO.
Also, Font Constructor lets you generate a .otf font file of your font. This is a very rough font file, so be careful with it. Use it only to test it. But the .otf will show up in the font list of most of the popular graphic typesetting applications.
The .otf font file has no kerning, no hinting or features. Actually, it only contains the contours of the glyph, spacing and some basic naming. These generated fonts have not been tested in a Windows environment, but yeah...
Have fun with Font Constructor !!