as "fog2ufo.vfpy" and run FontLab 7 in commandline with the path to "fog2ufo.vfpy" as commandline argument. Change fontFileName as needed (in this version, it needs to be in the same folder as "fog2ufo.vfpy").
I don't think there is such thing as .fog files spec (there are 2 .fog file formats, btw), I think I made parser by checking Fog code + applying it to some sample fog files.
@Adam Twardoch Out of interest, does FL6 use a different method for opening .fog files? I tried opening one recently in it and found everything to be super pixelated and couldn't be edited. FL5 worked fine.
Was it FL6 or FL7? There might be some bug in the FL7 code. I checked some .fog files and they worked fine, including fractional coordinates etch FOG & FL7 support but FLS5 does not.
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It'd help if you could share the failing font via https://support.fontlab.com/ so we can see what's going on.
.fog format also supports embedded bitmaps, maybe they're interfering.