Originally Posted by Nisall
Odd, because it works fine for me. I download the .xlsm file directly from link without it being a zip/rar file.
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I guess it depends on what software you have installed on your system. If you have XLSM as a registered shell format on your pc, it'll probably recognise it, if not, the detection heuristic will likely (correctly) identify it as a zip.
An XLSM (macro-enabled excel workbook) file afterall
is a zipfile which contains a number of XML files. It's microsoft way to make an open format (xml) while reducing file size (zip) in a way other programs can easily access it as well.
So the detection as ZIP in your browser is normal (to a degree) and means you don't have a specific XLSM format registered on your pc. To read it, you will need a program/spreadsheet that can open/convert XLSM files.