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Latest revision as of 23:19, 24 April 2018
XLSM is the variant of XLSX (the Microsoft Excel format used starting with Office 2007) which allows the use of macros. This poses a greater security risk than normal non-macro spreadsheet files, because macros are a form of computer program which can do actions automatically, possibly malicious ones, which is why a distinct extension is used to distinguish documents which may have macros in them from ones that don't.
Macros are created in Visual Basic for Applications (VBA).