XLTX files are spreadsheet templates created with Microsoft Excel versions 2007 and above. Microsoft Excel is compatible with multiple operating systems and it's currently one of the top applications for creating and editing spreadsheets.

Excel stores data in worksheets, each having a grid of cells arranged in columns and rows. Cells can contain text and numbers of various fonts, colors and sizes. The default file format of Microsoft Excel is XLSX. These files can include charts, pivot tables, graphs and mathematical functions and also support the Visual Basic macro programming language for applications.

XLTX templates are used to store the entire structure of a document. By creating a template the whole process of building a specific type of spreadsheet from scratch can be avoided. Once the template is created, users can simply add text and other content and save it. Excel will create a new XLSX file which will inherit all formatting options and will leave the XLTX file unaltered.

XLTX files are based on the Open XML format which stores all content in a zipped archive. The archive contains XML and RELS files stored in three separate folders named �"docProps”, �"xl” and "_rels". Files with the RELS extension dictate how the parts of the document connect to form a single file. The archive also includes a [Content_Types].xml file which describes the spreadsheet and separate XML files for each worksheet. This archived approach makes file content more accessible. For example images and text are stored individually within the archive.

How to open XLTX files

The contents of an XLTX file can be extracted individually by opening it with a data compression application (i.e. WinZip or WinRAR). The XML files of an XLTX document can be opened with any basic text editor and any web browser.