Unsupport excel file

I need help.I can’t upload excel file .Error message is " File is unsupported" .Please help me this issue or Please tell me how is supported excel file .Many thanks.

a google practice is not using Vietnamese in path, or file name.

it is happening to me same issue . I think the file is with errors…because when i opened manually , a warning appears . I think because there is an format error in the .xls file