Windows .FNT resources

Bitmap font formats

Versions 2.0 and 3.0 bitmap .fnt resources are well documented by Microsoft Knowledge Base 65123 which is available in several places on the web, though no longer directly from Microsoft.
That document does not describe Version 1.0 which is documented in the MS Windows SDK 1.03 Programmer's reference. See Appendix C: Font Files (p. 432 ff.)
Neither source documents the format in which vector glyphs are stored, and I have not found any definitive sources on this. My reverse-engineered notes below.

All vector .fnt files I have seen were Version 1.0 files, including those supplied with later versions of Windows.
If fixed width, these vector fonts have a v1.0 GlyphEntry structure in the CharTable, which is simply

    GlyphEntry    
    geOffset: uint16      // pointer to the stroke instructions

    GlyphEntry    
    geOffset: uint16      // pointer to the stroke instructions
    geWidth: uint16       // width of the glyph, in design units

Note that this structure has the geWidth and geOffset fields swapped compared to a v2.0 bitmap .fnt.
The glyph information is stored in the same place as the bitmap strike in a bitmap .fnt. Instructions consist of 2 signed bytes in the range [-127, 127], representing the X and Y relative offset of the move.
- each pair represents a move drawn with a straight line,
- unless it is preceded by 0x80 (-128) and represents a move without a line.
The coordinate system has origin at the top left of the glyph; positive directions are rightward and downward.