UPDATE 1-Dassault Systemes lowers 2009 forecasts

* 2009 non-IFRS revenue to fall between 5 and 9 pct

* Says Q1 non-IFRS EPS 0.37 euros

* Says Q1 non-IFRS operating margin 19.4 pct

PARIS, April 30 (Reuters) - French software firm Dassault Systemes (DAST.PA) cut its 2009 revenue and earnings goals because of the global economic downturn as it posted a 6 percent decline in first-quarter revenue.

Dassault, whose clients include global giants Boeing (BA.N) and Sony (6758.T), said it now expected 2009 non-IFRS revenue to fall by 5 to 9 percent. The group previously expected non-IFRS revenue to rise by 1-3 percent.

The group also cut its full-year earnings per share estimate to a range of 1.78 to 2.00 euros, against the 2.02-2.12 euros per share it had expected in February.

"The first quarter brought further deterioration of the economic environment, which led to a significant decrease in our new licence activity across brands and geographic regions," Chief Executive Bernard Charles said in a statement on Thursday.

The company had pre-announced first-quarter earnings on April 16, saying it had missed its sales target and was likely to cut its goal for the full year.

Final first-quarter figures showed revenue was 310.7 million euros ($411.7 million), down 6 percent at constant exchange rates, while earnings per share fell 10 percent to 0.37 euros and the operating margin was 19.4 percent.

The group added that it now expects a non-IFRS operating margin of about 24 to 26 percent for 2009, in line with the 25.5 percent it forecast in February. ($1=.7547 Euro) (Reporting by Michel Rose; Editing by James Regan)