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Attachment file names in email

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eevans1970
eevans1970

I use Firefox to access my Office 365 email. Suddenly all files attached to emails contain UTF8 in the beginning of the file name. But when the file is attached to the email the name does not contain those characters. It doesn't happen when using another browser. I've attached an image of two different files.

I use Firefox to access my Office 365 email. Suddenly all files attached to emails contain UTF8 in the beginning of the file name. But when the file is attached to the email the name does not contain those characters. It doesn't happen when using another browser. I've attached an image of two different files.
Attached screenshots