Why are my uploaded excel files being converted automatically to html format when I send email?


When I send excel files that I upload into my yahoo email, they seem to be converting themselves in the process of being sent to an html format? Even when I send the email to myself, I cannot open the excel files because they are listed as html. How do I fix this problem? Is there a setting that’s set incorrectly in yahoo, or in my computer maybe? Thanks for any help.
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