AGAIN problems with attachments and russian characters

AGAIN problems with attachments and russian characters

Dear Zoho Mail Team,

We are AGAIN facing strange problems with attachment that contain russian characters.
Now Zoho Mail complains about some names "Attachment name cannot contain special character."
And i can't figure out what are they.

See the attached screenshot, first and second names are mostly identical exept the latest character. Zoho doesn't like the second name. And tried to create a file with that character and it was attached successfully. So i can't understand what's the problem.

Please, fix ASAP.  User complain EVERY day there  are different problems with Zoho, they are very angry.

EVERY Zoho App had and has problems with non-latin characters: Docs, CRM, Recruit, Mail, Support etc. Look at my requests, every third request is about Russian language.

Why don't you make your apps unicode-aware, is it so hard using Java?

Thank you.