This is for Aztech MPD3880 SP-U. Also for Dell PN 969NU PCI fax modem with audio output for sound card. This one totally works, including sound from modem to sound card (by a green cable). DL from Aztech site, after trying over 20 other different versions which had no sound, or crashed in Win98SE (took over 5 hours to get it right). There is NO setup.exe file, so just use 'Find New Hardware, and point to folder where the unzipped files are, to install.