Some programs can read and process multimedia files even from compressed archives (for example RAR). But such archive can contain everything, so there is no clear answer for rar to wav conversion, except that in some scenarios it is possible.
Convert WinRAR RAR compressed archive to WAVe PCM Sound, standard Windows sound format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert rar to wav on Windows
A text-to-speech software
Convert from rar 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.