I can't use DBI with ruby mingw32 on windows

I use DBI :version => 0.4.1 with
activerecord-sqlserver-adapter- on both ruby’s version. The
same rails application that works on mswin32, doesn’t work on mingw32, i
obtain this message:

Unable to load driver ‘ADO’ (underlying error: uninitialized constant

i can’t find where this constant must be initialized.

if i remove the ADO.rb from mswin32 version path:

i get this different message:

Could not load driver (no such file to load –

Does anyone had similar trouble?