What happens when Excel wants to save an XSLB file? Not much really. It resembles the old XLS file format which was also a binary file. The XLSB file format on the other hand is a binary Excel file. When an XLSX or XLSM file is saved Excel needs to break it down into separate XML files, compress it and finally save it as XLSX or XLSM. That is because Microsoft has opened the Excel file format and decided to break the insides into XML files. XLSX and XLSM files are in fact compressed archives with XML files inside. So what is inside an XLSX (or XLSM) file (image on the right). a single integer variable in an XML file will have to be embedded in a set of tags. The downside of text files is that they need overhead to build the structure into the text file itself e.g. Text files on the other hand (JSON, XML, CSV, text), as the name suggests, are files that can be opened in text editors (Word, Notepad etc.) and their structure is built into the file can be understood by simply reading the file.įor example a XML file usually it’s own notation of tags and markup, a HTML webpage has universally accepted standards such as HTML5, CSV files have columns and rows separated by column and row delimiters. Binary files can only be opened if you know the exact type of object that is the file. If you open binary files they might seem like gibberish. This is because binary files are a raw dump (basically 1’s and 0’s) of memory. Binary files are usually read and written to much quicker and are more smaller than non-binary files. Excel file size still too big? Check out my post on How to reduce Excel file size What is an XLSB file format?Īn XLSB file is a Excel Binary Workbook file format.
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