It might be possible that your *._xls files are just renamed Excel spreadsheets. If that is the case, you can just rename it to XLS, open in Excel and work with it like you wish. In order to get XLSB workbook, you just need to re-save it using the File → Save as.. function.
Convert Microsoft Excel workbook to Microsoft Excel binary workbook file.
We have found 2 software records in our database eligible for ._xls to .xlsb file format conversion.
Microsoft Windows software - convert _xls to xlsb on Windows
A popular spreadsheet application distributed with Microsoft Office suite, Excel is offers calculating, contains graphing tools, pivot tables and own programming language based on Visual Basic.
Excel supports charts, graphs or histograms generated from specified groups of cells. Excel also can change data between other Microsoft Office applications. It is available for Microsoft Windows, Mac OS X (macOS) and various mobile platforms.
Convert from _xls file
|Yes, Microsoft Excel supports _xls file conversion as a source file type.||Yes||Yes||_xls editor||Yes||No||No||No|
to xlsb file
|Yes, Microsoft Excel supports xlsb file conversion as a target file type.||Yes||Yes||xlsb 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 xlsb. 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 _xls to xlsb on OS X
Microsoft Excel for Mac is popular spreadsheet application used to analyze, organize and manage data and lists. It is able to create visually rich datasheets and tables with icons, data bars and color scales. Microsoft Excel for Mac is fully compatible with Microsoft Excel for Windows.