How to Disable the 'These Files Might Be Harmful to Your Computer' Warning

Posted by Jim Tanous on May 16, 2018
these files might be harmful to your computer

If you’ve mapped a network drive or server to your Windows PC via its IP address, you may see a warning message when attempting to transfer files from the network location to your local drives: These files might be harmful to your computer. Clicking “OK” dismisses the warning and transfers your files, so it’s not a major issue for occasional file transfers. But if you frequently transfer files between your local and networked PCs, having to dismiss this warning every time can quickly become annoying.
Fortunately, you can disable this warning by configuring the way that your PC views your networked storage device. So here’s how to disable the These files might be harmful to your computer warning message in Windows. Our screenshots below show Windows 10, but these steps also work in Windows 7 and Windows 8.
these files might be harmful to your computer

These Files Might Be Harmful to Your Computer

The change we need to make to disable this warning message is located in the Internet Options control panel. The quickest way to get there is to simply search for Internet Options from the Start Menu. Alternatively, you can navigate to Control Panel > Network and Internet > Internet Options.
internet options start menu
From the Internet Properties window that appears, select the Security tab at the top of the window and then click the Local Intranet icon. With Local Intranet selected, click the Sites button.
internet properties local intranet
A new window labeled Local Intranet will appear. Click the Advanced button at the bottom of the window.
local intranet advanced settings
Here, you can add the IP addresses or DNS names of your locally networked PCs and storage devices. Windows will treat any addresses added here as trusted local resources and will therefore not bother to warn you when you transfer files from them. For example, we have a NAS that has been mapped to our local PC via its IP address (
these files might be harmful to your computer
Entering that address in the top entry box and then clicking Add will instruct Windows to trust connections to this device. If you have many networked PCs and devices, you can use wildcards (*) to avoid having to enter all of their individual addresses manually. Continuing the example, if we wanted Windows to trust all of the locally networked devices on our subnet, we could enter 192.168.1.* which would cover everything.
trusted site wildcard
Just make sure you know and trust the devices on your network. If you’re in a shared environment, adding all devices to your trusted list could result in potential security vulnerabilities, as you won’t receive any warnings when transferring files from unsafe or compromised devices.
Once you’ve added your desired addresses, just click Close to save your change and then OK on the Local intranet window. You can then close the Internet Properties window. If you’re already connected to one of the servers you just added, you’ll need to disconnect and reconnect to it for the change to take effect. You’ll now be able to transfer files from any of the PCs and devices you designated without seeing the These files might be harmful to your computer warning.

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