Dassault Systèmes to Adopt VSTA as a New Application Customization Solution in V5

Paris, France — September 14, 2005 — Dassault Systèmes (DS) (Nasdaq: DASTY; Euronext Paris: #13065, DSY.PA) today announced that it will adopt the new Microsoft .NET-based application customization solution, Visual Studio Tools for Applications (VSTA), within its V5 PLM (Product Lifecyle Management) solutions.

Support for VSTA is targeted at DS customers who have adopted .NET technologies. VSTA integration will help these customers to extend V5 solution capabilities in line with their specific needs by offering a significantly advanced environment to capture, store, enrich and reuse their in-house best practices and knowledge. Furthermore, because VSTA will run alongside existing VBA code, older and newer implementations of the V5 PLM solution will work side-by-side.

“Our customers have been capitalizing key, in-house best practices for years,” said Florence Hu-Aubigny, director, Research & Development, Open Architecture for Dassault Systèmes. “By adopting VSTA, we want to offer them the power to optimize the use of their corporate knowledge easily and cost-effectively within their V5 PLM environment.”

“Dassault Systèmes is a strategic partner and we are delighted to offer value to their customer-base by providing next generation application customization technologies,” said KD Hallman, general manager of Visual Studio Tools for Applications at Microsoft Corp. “By integrating VSTA with its V5 PLM solution set, Dassault Systèmes is meeting the needs of customers who have adopted .NET. These customers now have an optimized and managed code programming environment that takes application customization to the next level.”