Not sure if this is truly a WIN 10 issue or not, but I'm trying to attach a .exe file to a Yahoo! email and though I can attach it a message is included with the attachment saying File Type Not Supported and I realize that .exe files are suspect due to potential malware issues, but actually the .exe file is for encryption software that I want to send to someone. Is there a WIN 10 mail issue regarding support of .exe files or rather is this a Yahoo! mail issue?