Invalid OTF files on Windows: cmunvt.otf and cmunvi.otf
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I use CMU unicode fonts since version 0.6.0, under Windows XP (SP2), using the OpenType format. All fonts work perfectly except these two:
CMU Typewriter Text Variable Width (cmunvt.otf) and CMU Typewriter Text Variable Width Italic (cmunvi.otf).
Windows inform they are not valid font files. The error still occurs in version 0.6.3.
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It is known issue. Look at http://cm-unicode.sourceforge.net/warnings.html (The fonts CMUTypewriterVariable and CMUTypewriterVariable-Italic cannot be installed under Windows due to long family name).