OMG, now it's running!
I got it:
- BEFORE, i right-clicked -> New... -> MS Word document, and instantly renamed it to "help.rtf", and finally double-clicked it for editing.
This does NOT create an RTF file, but a DOC file with RTF extension!- NOW, i opened Word, File -> New, edited, File -> Save as... -> RTF document.
Everything OK.
Thankyou!