below error message has occurred while uploading the Microsoft publisher file from the K2 media manager. i have allowed .pub extension  and also allowed the below-mentioned MIME type in the media setting but still, I'm unable to upload the publisher file from K2 Media manager.
 
Thank you in advance!

Thank you for your suggestion. i have tried with a zip file but zip file type is not allowed error message is displayed.
already added zip MIME type and extension in the media setting.

I have also tried with other formats like word, pdf, and image but all are working fine.

Thank you for your quick response. i have added 'application/vnd.ms-publisher' in media.php file and the file type error is resolved but only the 'pub' extension error is displayed.

could you please advise where should i add (file name) the '.pub' extension to upload in K2 Media manager ?

Many Thanks

I don't think so it's our server-side because we are able to upload Publisher format from the media manager. the problem is only from K2 side.