Summary

User has Windows 7 (32 or 64 bit) and when they open a ZIP file directly from within an email, nothing happens.   If the user saves the ZIP file from the email to the C Drive then opens it, it works normally.

Solution
For 32-bit version of Windows
• Open Registry Editor (Start > regedit)
• Navigate to the following key
• HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionShellCompatibilityApplicationsoutlook.exe
• You will see the following entry:
VERSION = 11.*;10.*;9.*;8.*;7.*
Edit the Version value and remove the 11.*;

For 64-bit version of Windows
• Open Registry Editor (Start > regedit)
• Navigate to the following key
• HKEY_LOCAL_MACHINESOFTWAREWoW6432NodeMicrosoftWindowsCurrentVersionShellCompatibilityApplicationsoutlook.exe
• You will see the following entry:
VERSION = 11.*;10.*;9.*;8.*;7.*
Edit the Version value and remove the 11.*;