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If you are missing a file due to your Anti-Virus software falsely labeling it as a virus then you must add the game folder where you installed UMF to as an Exclusion in your Anti-Virus software.
This covers Microsoft Security Essentials for all Windows versions before Windows 10.
It is recommended you upgrade to Windows 10.
If on Windows 7 or newer, the default Windows AV will now enable it self again.
In case of older versions of Windows or the the default not enabling it self again, you should install Microsoft Security Essentials for some protection.