As far as we know, this conversion seems to represent an attempt to resave two versions of yBook ebooks between one another, namely .ybtxt (based on TXT) and .ybrtf (based on RTF) files. The only program capable of the conversion seems to be the original yBook and no other.
Convert Ybook ebook file to Ybook ebook file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert ybtxt to ybrtf on Windows
yBook is a freeware ebook reading software with support of some current ebook formats.
Convert from ybtxt file
to ybrtf file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.