ClamScan is a product of the ClamAV project, and does not use the clamwin config file.
If you want to use the config with a command line, use this in stead :
"C:\Program Files\ClamWin\Bin\ClamWin.exe" --mode=scanner --path=C:/ |
This starts the GUI though, and after the scan completes, you will have to push the Close button. I'm not a 100 percent sure about this, but i don't think there is an other way.
The configuration file in \Program Files\ClamWin\Bin is holds the default configuration. When a user logs on the first time after clamwin is installed, this file is copied to \Documents and Settings\username\Application Data\.clamwin\.
This way, each user has its own settings.
budtse