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Unable to Create XLWorkbook from Excel Template (.xltx)

Sep 4, 2015 at 3:06 PM

I am getting an exception saying that "Extension .xltx is not supported" when trying to create an XLWorkbook by passing it an .xltx file. However, I see here in the discussions that people say you can open a .xltx file. Am I doing something wrong and is there a different way to open a template?
Apr 27, 2016 at 10:51 AM
Same error. No suggestions?
Apr 27, 2016 at 1:59 PM
As a workaround I ended up using Excel interop to open the .xltx file and save it as .xlsx before opening it with ClosedXML.