Files with *.xlk extension are Excel spreadsheet backups used in some of the older version of the program. These files are supposedly still supported even in latest Microsoft Excel and you should be able to open them with Excel and save to some other spreadsheet format, including XLSX or XLS.
Convert Microsoft Excel backup file to Microsoft Excel Open XML workbook and spreadsheet.
We found 2 software records in the database related to .xlk to .xlsx file format conversion.
Microsoft Windows software - convert xlk to xlsx on Windows
A popular spreadsheet application distributed with Microsoft Office suite
Convert from xlk file format
|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 xlk 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.
Apple macOS / Mac OS X software - convert xlk to xlsx on OS X
A popular spreadsheet application from the Microsoft Office suite