The 'CSV Product Import' extension works with csv files only. The xls file has to be converted to csv format before importing. In MS Excel application you can save the file as UNICODE TEXT and later import it with parameters:
field delimiter: tab
charset: UNICODE
Warnings about losing formulas or formatting can be ignored while saving the file to a 'UNICODE TEXT' format because we need just the raw data from that file.
If you experience any problems with the saved csv file, feel free to consult us regarding how to import your file.
