We have found one software suitable in our database for this conversion.
tns to xls conversion is most likely searched by users that are looking for a way to transfer spreadsheet data from TI-Nspire to Excel. It doesn't seem that easy way exists and the only thing you can do is to manually copy and paste the output data, that is without any formatting and/or formulas.
You can also try out the CellSheet converter provided by TI, but that probably does the same thing.
Updated: January 20, 2023
TNS
Files with tns extension can be mainly found as documents for TI-Nspire range of graphic calculators produced by Texas Instruments
XLS
Files with xls extension are best known as spreadsheets from Microsoft Excel. A spreadsheet is basically a grid of cells sorted in rows and columns. Each cell can contain text, numeric or formula data. Excel XLS spreadsheets can be opened in most other similar programs, such as OpenOffice.org Calc.