I can install fonts from TTF files, but I've encountered a TTC file. Font Manager recognizes such files as fonts and will display the different typefaces in the family, but it renders them incorrectly (as generic san-serif). If I try to install them, I get the above message. I can install other fonts from the same source directory.
Anyone know what gives here? Windows has supported TTC files since Windows 2000, so this should be working.