You can simply re-save XLS spreadsheet to XLSX format in Microsoft Excel. This might also be done in other programs, but using the default program would be best.
Convert Microsoft Excel 97 to 2003 workbook to Microsoft Excel Open XML workbook and spreadsheet.
We found 23 software records in the database related to .xls to .xlsx file format conversion.
Microsoft Windows software - convert xls to xlsx on Windows
A popular spreadsheet application distributed with Microsoft Office suite
Convert from xls file format
|Yes, Microsoft Excel supports xls file conversion as a source file type.||Yes||Yes||xls editor||Yes||No||No||No|
|Yes, Microsoft Excel supports xlsx file conversion as a target file type.||Yes||Yes||xlsx editor||Yes||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned xls to xlsx. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
An universal picture and document converter
A spreadsheet software application from Corel
A program used to create and manage information databases
A suite of analytics software products
A powerful database to database converter
Fully-featured version of Navicat for Windows
A handy spreadsheet editor from SoftMaker Office suite
Apple macOS / Mac OS X software - convert xls to xlsx on OS X
A popular spreadsheet application from the Microsoft Office suite
A database management program for Mac
A full-featured set of office applications for Mac OS X
A spreadsheet application from Apple
Windows Mobile/CE software - convert xls to xlsx on Windows Mobile
A fully working office suite for Windows Phone smart phones
Symbian software - convert xls to xlsx on Symbian
An Office document editing app running on S60 based smarthones
Apple iOS (iPhone, iPad, iPod Touch devices) software - convert xls to xlsx on iOS
A preadsheet editing application for iOS
Google Android software - convert xls to xlsx on Android
A complete mobile office app for Android
Blackberry mobile phones and devices software - convert xls to xlsx on Blackberry
Office suite app for BlackBerry devices.
Multiplatform software - convert xls to xlsx on any platform
Google Chrome extension for Google Drive
Full-featured spreadsheet tool from LibreOffice suite
Spreadsheet program from OpenOffice.org productivity suite
On-line services software - convert xls to xlsx on web
Spreadsheet web app from Google