ANOTHER SOLUTION:
Using Dosbox, you can trick the game into thinking that c:\rtz is the CD-ROM drive c:\.
unzip the files into c:\rtz
load up dosbox
>mount c c:\rtz
>c:
>install
set the directory for installation to c:\rtz-cd (which is actually c:\rtz\rtz-cd)
after the installation is complete, run the install.exe in the rtz-cd directory FROM WINDOWS, not dosbox. Set up the sound and set the CD-ROM directory to 'Drive C:'.
The working directory for RTZ will be shown as c:\rtz\rtz-cd, that is okay.
Then run rtz.bat through dosbox, this worked for me and I have sound.
-Timelord
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