here is software I used to help a client port his legacy apps to new systems:
http://www.sysinternals.com/ntw2k/fr.../diskmon.shtml
http://www.sysinternals.com/ntw2k/source/filemon.shtml
http://www.sysinternals.com/ntw2k/source/regmon.shtml
they allow you to see realtime process activity to files/registry/disk etc. pretty
useful!