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Convert a generated Excel (with OpenXml) to a regular excel format ?

Jan 24 at 1:03 PM

I have a situation where a customer is rejecting my excel files (generated with epplus) because of a filter on their email servers.
Indeed, they accepts "classics" excel files, but the ones created with the OpenXml format, they reject it (thinking it is not an excel but some malicious code).

Is there anyway that I can "convert" the generated one into a regular one without using Excel ? Just with .net code ?

Else I'll have to use the com interop and use excel right onto the server just for that customer :(