get wine and configure it.
do this in this order.
make some new directories in wine.
$mkdir ~/.wine/drive_c/mozactivex $mkdir ~/.wine/drive_c/win32dlls $mkdir ~/.wine/drive_c/vagcom
download mozactive x from here and save to your desktop, do not open with wine http://www.iol.ie/~locka/mozilla/MozillaControl177.exe
$mv ~/MozillaControl177.exe ~/.wine/drive_c/mozactivex/
download these two dlls http://www.dll-files.com/dllindex/dll-files.shtml?msvcp60 http://www.dll-files.com/dllindex/dll-files.shtml?mfc42
unzip these and move them to the win32dlls dir you just created.
then download the version of vag-com you will need according to your interface http://www.ross-tech.com/vag-com/download/
mine was a third party interface, (opto coupler) that was in their downloads archive page.
save the package to disk and mv to your vagcom dir
now install the active x plugin like this
$cd ~/.wine/drive_c/mozactivex/ $wine MozillaControl177.exe
then
$cd ~/.wine/drive_c/vagcom/ $ls $wine (version of vag..exe)
now to run vag $cd ~/.wine/drive_c/vagcom/ $wine vagcom.exe
and then your there.
whew.. this was harder than that for me.