![]() When you open an unfamiliar XLSM file in Microsoft Excel, the program will typically ask whether you want to enable macros. ![]() XLSM files are saved using the same Open XML-based format used by XLSX files, but XLSM files can store macros, while XLSX files cannot. If a user who has utilized macros to create an Excel spreadsheet wants to retain those macros when they re-open or share the document, they must save the document as an XLSM file. Some examples of macro functionality include formatting data in a selected column of a spreadsheet or applying specific mathematical equations to data. Excel comes loaded with hundreds of macros but you can also record your own macros, which consist of keystrokes and mouse clicks that execute a specific action, and edit them to make minor changes. To use the sample code in this topic, you must install the Open XML SDK 2.0. Normally, VBA is used to develop programs for Excel to perform some tasks. VBA is a programming language used by Microsoft Office suite. ![]() xlsm) that spread malware by executing malicious VBA (Visual Basic for Applications) code. It contains an example AddCustomUI method to illustrate this task. Lately, Fortinet has collected a number of email samples with Excel files attached (.xls. A macro is a useful feature that functions like a script, which allows users to automate repetitive tasks. This topic shows how to use the classes in the Open XML SDK 2.5 for Office to programmatically add custom UI, modifying the ribbon, to an Microsoft Excel 2010 or Microsoft Excel 2013 worksheet.
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