A file with the XLSX file extension is a Microsoft Excel Open XML Format Spreadsheet file. It's a ZIP-compressed, XML-based spreadsheet file created by Microsoft Excel version 2007 and later.

Is Microsoft’s Open XML document standard “so complex and so geared towards compatibility with legacy Office compatibility that it could never be implemented as a fully functional file format ...

Citing statements of support from more than 300 companies and organizations, Microsoft claimed on Tuesday that interest in its Office Open XML file format continues to grow. Comments backing the ...

Ecma, the international standards body accepted Microsoft's proposed Open XML File Format submission for standardization.

Opponents of Open XML, which is the default file-saving format in Microsoft Office 2007, say there is no need for a rival standard to the widely used Open Document Format (ODF) that is already an ...

Property lists are essentially XML files with a .plist extension. Here's how to edit them using the command line in the macOS Terminal app. XML is an open data format which gained popularity in ...

But perhaps the most important update in this version is improved interoperability with Microsoft Office file formats like DOCX, PPTX, and XLSX. Apparently, users were experiencing bugs when opening ...