Error when reading a file from Excel to a spreadsheet document?

Question

1C

I am trying to read an excel file into a spreadsheet. The "xlsx" format file is read without problems, but the "xls" format file gives an error. Where is the mistake?

Answer 1

1. more about what code...
2. Description:
Reads a spreadsheet document from a file.
Allows reading a spreadsheet document from a Microsoft Excel 97 - 2010 spreadsheet file (*.xls and *.xlsx) or an OpenOffice Calc spreadsheet (*.ods).

Answer 2

Sometimes under the .xls extension, the file is actually written in .xlsx