Attachment changed their type

Occasional Visitor

I used Office 365.

In this several week, I found all of the attachment are changed their type. 

For detail : 

attachment for excel the type should be .xlsx but it's changed tp be .xls_

attachment for word the type should be .docx but it's changed tp be .doc_

attachment for pdf the type should pdf .xlsx but it's changed tp be .pd_

 

How can I fix it?

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