.XLS3 File

The xls3 file extension is associated with Microsoft Excel, one of the most popular and powerful tool you can use to create format spreadsheets, graphs and much more.

The .xls3 files were used in Microsoft Excel 3 for Mac for spreadsheet files.

The default file extensions, that are used by Microsoft Excel, are XLS or since Microsoft Office 2007 the XLSX.

How to open:

Use Microsoft Excel 3 to open the .xls3 files.

How to convert:

As far as we know, this .xls3 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.