DVB files are basically text files, so should you need it, you can simply change the extension.
Convert DVBLine document file to Simple text file.
We found 2 software records in the database related to .dvb to .txt file format conversion.
Microsoft Windows software - convert dvb to txt on Windows
A free source code and text editor for Windows
Convert from dvb file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned dvb to txt. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert dvb to txt on OS X
The default text editor in Mac OS X