Dear Kaspersky Community, I thought of sharing a solution to something that recently has hit a lot of users where Outlook email attachments are showing as blank icons and the file extension changes to underscores in the last character, for example: “.pdf” shows as “.pd_”, “.docx” as “.doc_” “.png” as “.pn_” Email pictures included in HTML formats are also broken and the right-click properties all greyed out. Solution: Close outlook. Open Kaspersky Internet Security > Go to Protection (left pane) > Mail-Anti-Virus > Advanced Settings > disable the renaming of all extentions, leaving the dangerous ones enabled: *.bat, *.сmd, *.com, *.exe, *.js, *.jse, *.msi, *.scr, *.vbe, *.vbs. Open Outlook. This solution fixes all new incoming email. Unfortunately past emails affected by this will not be changed - so to manually solve this: show extensions > save attachment file type without the "_", then file properties and unblock.