They will need Winamp.
DNAS is the server program.
However, if someone would like to listen with RealPlayer/RealOne or Windows Media Player, then you will need to direct them to these files...
For the .asx (WMP).. put the following in a notepad document and then save it as <whatever>.asx
Of course, change things to fit your needs.
Note: This only works in WMP 7.1 and up
Note the trialing slash after "yourPORT"
For the .ram file to open a RealPlayer stream, enter the following into a notepad document:
Then save that as <whatever>.ram
Simply upload those to your website and link them and they will open in the appropriate player.