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[The Fifth Horseman]

To change properties of a file in Windows, select it (left-click/shift-left-drag/ctrl-left - whichever you prefer), and right-click on it. Select "properties" from the menu. Pretty straightforward.

As for not being able to run the game, plese tell me what exactly you have done so far.
I understand you are using DosBox and have mounted the directory. That's a good start - believe it or not, but most new people have problems getting past that stage.
Now, are the values in the sound config corresponding to the ones in Dosbox.conf? You might want to double-check.
If that's allright, run the following three commands:
dir *.exe
dir *.bat
dir *.com
EXE, BAT and COM are three types of files most commonly used to start games. These three commands will provide you with a list of files with these extensions in your game directory.
Try the BAT files first, EXE and COM second.