I HATE Image Preview, and this is the only way I've found to get rid of it. Go to: HKEY_LOCAL_MACHINESOFTWAREClassesCLSID{e84fda7c-1d6a-45f6-b725-cb260c236066}shellex and delete the subkey: MayChangeDefaultMenu Reboot. Images will now open in your default viewer by double-clicking. You can still right-click and select PREVIEW if you want to open it in Image Preview. If you want to get rid of the PREVIEW menu option entirely, you can go to HKEY_LOCAL_MACHINESOFTWAREClassesCLSID{e84fda7c-1d6a-45f6-b725-cb260c236066}InProcServer32 and for the (Default) Value, delete the data so it is empty, "". Reboot. No more "Preview" option on right-click.