Microsoft Corp has launched the Visual Basic 4.0 programming system for Windows95, Windows NT and Windows 3.1. As well as Standard and Professional versions of the rapid application development environment comes there’s a new Enterprise Edition for corporate and team developers. All include enhanced Object Linking & Embedding support, improved data access, an open visual development environment, and seamless migration to Windows95 and Windows NT for existing applications, and support 32-bit application development, and provide data access with Open Data Base Connectivity 2.0 and the Jet 3.0 database engine, Microsoft says. The Enterprise Edition includes tools to create enterprisewide distributed applications, including three-tiered, client-server applications. All three are out by the end of the month, Standard Edition at $100, $50 to upgrade; Professional at $500, $100 to upgrade; Enterprise Edition is $1,000 for new users, $500 for Professional users.