METHOD:
1. paste RTF content to InputRTF TEXTAREA,
2. press "Convert" button,
3. get RTF from OutputRTF TEXTAREA.

replace "fonttbl" RTF tag.

Input RTF:
{\rtf1\mac \deff387\deflang1033 {\fonttbl{\f38\fnil\fcharset77\fprq2 \'8b\'e0\'f2\'e8\'ed\'f1\'ea\'e8\'e9;} {\f387\fnil\fcharset77\fprq2 \'8f\'f0\'df\'ec\'ee\'e9 \'8f\'f0\'ee\'ef;}} {\*\pnseclvl8\pnlcltr\pnstart1\pnindent720\pnhang{\pntxtb (}{\pntxta )}} {\*\pnseclvl9\pnlcrm\pnstart1\pnindent720\pnhang{\pntxtb (}{\pntxta )}} \pard\plain \qc\fi720\nowidctlpar \f387 {\b\f38 Beg of test RTF - \'81\'e0\'e7\'e0 \'84\'e0\'ed\'ed\'fb\'f5. \par }\pard \qj\fi720\nowidctlpar {\f38 \par 1. \'88\'f1\'f2\'ee\'f0\'e8\'df \'90\'ee\'f1\'f1\'e8\'e9\'f1\'ea\'ee\'e3\'ee \'e3\'ee\'f1\'f3\'e4\'e0\'f0\'f1\'f2\'e2\'e0. \par \par 2. \'8c\'f3\'eb\'fc\'f2 \'e8\'ec\'e5\'e4\'e8\'e9\'ed\'fb\'e5 \'ef\'f0\'ee\'e3\'f0\'e0\'ec\'ec\'fb \par \par End of test RTF in MacCyrillic encoding with strange fonts. \par }}

Output RTF:
still void taOut - out RTF
Output HTML - non-ASCII text in UniCode (for test purposes):
still void taOu2 - HTML source