XnView Software

windows 7 64bit

thunderbird is set as default and it works in other apps, in xnviewmp evry time i send a email it says "Either there is no default mail client or the current mail client cannot fulfill the messaging request" but when i click ok it open thunderbird correctly and sends email.

when i try to send a email with xnviewmp i have a message "Either there is no default mail client or the current mail client cannot fulfill the messaging request". when i click ok it open thunderbird correctly and i can send email but i must always ok en error message.

thnerbird is set as default ...