Your Privacy Matters: We use our own and third-party cookies to improve your experience on our website. By continuing to use the website we understand that you accept their use. Cookie Policy
Unable to load .xlsm file in .Net Standard 2.0 Project with Exception - Invalid or unrecognized file format. (Parameter 'stream')

Trying to load a xlsm file in the workbook using --> 


Getting an exception - Invalid or unrecognized file format. (Parameter 'stream')

This is a dot net standard 2.0 project. The same line of code works fine in a .net framework 4.6 project. 

Any ideas on what can be the issue ?