Solid Edge is a mechanical design system with exceptional tools for creating and managing 3D digital prototypes. Solid Edge modeling and assembly tools enable your engineering team to easily develop a full range of products, from single parts to assemblies containing thousands of components... (
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The program works with the following extensions: 
asm, 
pwd, 
par, 
dft, 
psm, 
x_b, 
x_t, 
xmt_bin and 
xmt_txt