ES> Microsoft says that fonts with CFF data or fonts containing TrueType
ES> outlines that have OpenType layout tables should use the "otf"
ES> extension otherwise the "ttf" extension should be used.
>From the OpenType spec:
Filenames
OpenType fonts may have the extension .OTF or .TTF, depending on the
type of outlines in the font and the creator's desire for downlevel
compatibility.
* Fonts with CFF data always have an .OTF extension.
* Fonts containing TrueType outlines should use the .TTF extension
to enable the font to be used under older versions of Windows.
Placing a DSIG table in a .TTF makes it an OpenType font. In the
shell of OpenType-enabled systems, the font will be enumerated
with an OpenType icon, even without an .OTF extension. However, an
.OTF extension can be used if downlevel- compatibility is not an
issue.
Juliusz
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