If you chooose ‘Large Symbols’ in ‘View’ in the Windows Explorer, .otf and .ttf files get a preview thumbnail that shows the letters Abg of the typeface. You will have the same if you go to the Windows fonts directory. Some files only show ∑√≠. It seems like something is broken there. I’m guessing, it is something about the encoding, but i could not see what it is exactly.
![Image: http://cd8ba0b44a15c10065fd-24461f391e20b7336331d5789078af53.r23.cf1.rackcdn.com/typeboard.vanillaforums.com/editor/92/k6txg2331ci8.png]()
Does someone know how this works and what it needs to fix this?

Does someone know how this works and what it needs to fix this?