I`m using WinAVIVideoConverter for AVI to DVD convertion, When I tried to convert *.srt or *.sub files to *.sup subtitles streams using SubtitleCreator I canīt change the font and the outline color, these are the steps:

a) Open your downloaded subtitle file (in *.srt or *.sub format). If the source subtitle file consists of multiple parts, you can concatenate them.
b) Open the IFO file of the current DVD (normally VTS_01_0.IFO)

If I open a VTS_01_0.IFO file from a DVD that I rented the SubtitleCreator I can change the the font and outline color, Anobody why this happens?