Unable to extend surface in solidworks?

I have one imported surface & i have to extend side edges about 100 mm for press tool die design,and I could n't do it ,please help me to resolve this.I have attached that file

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That's a really bad model. The edges of it are made up of dozens of non-tangent segments.
I advise remaking a clean model, and not working with the imported model.

From the imported part you'd be lucky to extend the edges 10 mm before they start diverging. 100 mm does not look possible.

 
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