I installed a truetype font (OCR-B 10 BT) on a Windows Server 2003 system and tried to use RTF2PDF converter from an ASP.NET application on a document containing this font. I set FontMode to 1 and expected the font to be embedded but insted Arial was embedded.
I tried the same thing on my development machine (Windows XP SP2) and it worked as expected.
I then tried using the DEMO app to convert the same document on the server machine and this also worked.
Could it be that fonts are only installed for some users under Windows Server 2003 and that the user ASP.NET is running under doesn't have access to the font.