PDF-XChange Drivers API SDK provides Developers with a comprehensive set of Virtual Drivers to generate Adobe PDF Compatible files from their software applications using our best selling PDF-XChange print drivers for Windows 2000 and later (32 or 64 bit) - developers needing to support earlier versions of Windows (Win9x, ME, or NT) may also use our Version 3 products if required, though please note Version 3 products are no longer updated.