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If you have some font files that are valid fonts but cannot be used by an application because of the unsupported font file format, then you have to first convert their font file format. But the problem is that those fonts are not recognized by all the applications or operating systems. These fonts can still be found on some old archives online. For example, the BIN type fonts were introduced by Adobe as PostScript Type 1 fonts back in 1984. Some of these font types are rarely used now but are still available online. Adobe, Apple and Microsoft have been using a number of different types of fonts for decades.
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Font files have been in use since the mid 1980’s.
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