Can I stop windows from "Blocking" zip files
Solution 1:
I think this is what you want:
You do not say if you are using a Pro or home version.
If you you have a Pro version, open gpedit.msc (this is not available in home version, but is easier to use) and go to:
User Configuration>Administrative Templates>Windows Components>Attachment Manager
and enable the policy called
Do not preserve zone information in file attachments
Then run gpupdate /force from a command prompt.
If you have a home version of the OS, go to this registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
and edit the value for key
SaveZoneInformation to 2
You may have to create these keys, and if you want, you can also create them system-wide here:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
http://support.microsoft.com/kb/883260