Software & Apps File Types What Is an XLX File? How to open, edit, and convert XLX files By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated February 17, 2020 File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More Tweet Share Email A file with the XLX file extension is most likely associated with Xcelsius, as either a Crystal Reports file or an add-on file. Another way an XLX file was originally used was as a XoloX Incomplete Download file, a discontinued download manager. XLX Files and Microsoft Excel There's some confusion regarding XLX. While it might sound like a Microsoft Excel-based format, it's not. Microsoft Excel does not support XLX files and XLX files are not typical spreadsheet files. Microsoft Excel is the primary program that supports XLSX files (the newer format) and XLS files (the older format), even though XLX looks like those file extensions. Other formats used in Excel include XLK and XLL, but these are different from XLX. How to Open an XLX File SAP Crystal Reports can open and work with XLX files that are Xcelsius Crystal Reports files. Crystal Xcelsius will work too and is most likely how XLX add-on files are used. Use Notepad or another text editor to open the XLX file. Many files are text-only files and the file extension doesn't matter. A text editor may be able to properly display the file contents. This may or may not be the case with XLX files but it's worth a try. If an application on your PC does try to open the XLX file but it's the wrong application, or if you want another installed program open XLX files, you can change that in Windows. How to Convert an XLX File If you have an Xcelsius Crystal Reports file, you can most likely export it or save it as a new file format using the software mentioned above. However, if the file is used as an add-on, like most add-on files, you probably cannot convert it to any other format. A file conversion tool is needed to convert a file from one format to another. However, because of how some download managers work (by attaching a temporary file extension to the file during the download), rename the temporary file extension to what the program renames it.