If you are receiving email attachments in a different format than what was sent, here are some steps to troubleshoot the issue:

1. Check your email client for any updates.
2. Confirm you are using the latest version of the file format.
3. Confirm you have the right software installed to read the particular type of file.
4. If sending multiple attachments, ensure your email client is not changing the file type.
5. Try sending the file as an attachment rather than embedded in the body of the email.