When making presentations (like .sdp files in OpenOffice.org) you can you texts form a separate files (.txt) to be used on some of the slides. You can either copy it manually via clipboard or use the import function to do so.
Convert Simple text file to Apache OpenOffice presentation.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert txt to sdp on Windows
Older multi-platform office productivity suite
Convert from txt file format
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.