Can't sent .dwg files as attchement anymore with invoice

Can't sent .dwg files as attchement anymore with invoice

Hi,

i can't sent .dwg files anymore when i sent a invoice, i get the message "File types with extension dwg are not supported". But from begin this year untill now i was able to! so why it changed? and is there a way to fix this so i don't have to go toi my email client to sent my invoices?

Regards Jos