Which is the best extention while saving a model in Catia?

There are many extentions and out of many extensions which is the best extention that I can save that model. An extention that most cad softwares support

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i supposed in native extention, for second option maybe use STL, some softwares works better with them, igs sometimes import cut faces. you can try with both.

 
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step and iges are good extension files use that

 
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