Attachments converted from PDF to EML format

[AlanF49]

Attachments, in PDF format, from my partner's BTMail account, are being converted to EML format.

And are unreadable. I do not want to use MS Outlook etc.

I cannot see why!

Ideas please.

NB 'Compose message in rich text format' is ticked

[robertroot123]

Facing the same issue. Anyone can give the solution, please?

[gg30340]

Does this happen with all PDF attachments from all your email contacts or just from one contact's emails?