FileMaker "supports" any font that is installed on an OS. For it to work you need to install the specified on every system accessing the application as fonts are not loaded within the application from the server.
You can also use the TextFont() and TextFontRemove() functions to add or remove fonts on the fly to calculated fields.
Thanks for your help!
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Further to what Mike says, if you use font management software (eg. Suitcase Fusion, etc) you will have to ensure that the font you require is activated in order to make it available. FileMaker cannot itself activate fonts, unlike some software (e.g Adobe PS, Ai, IND, etc).
On Windows, FM supports only TrueType fonts.
(OpenType that has truetype outline also worked.)
Just want to thank everyone for their insights and comments... my problem is solved!!