msacm32.dsw is the VC++ project workspace for wamulti.
acm.pl is the script to generate the acm "forwarding" calls and variables from acm.c

the install\ directory contains the NSIS script to generate the
installer (WinampUser.nsi) and all required files. I used NSIS 2.09.
install\nsis-plugins\ contains plugins for NSIS that are needed (copy to the plugins
subdirectory of your NSIS installation)

for other questions, read the sourcecode and the comments therein, or contact me:
christoph@rosenkeller.org

Please remember: if you make some really neat changes, please let me know!
Happy coding! :-)