I think there are many users who use the software ``7-zip'' to compress and decompress files on Windows 10 and Windows 11.
Some users may have experienced this, but have you ever felt that it took a very long time to open a compressed file downloaded from the Internet using "7-zip"?
On this page, we will explain why it takes an abnormally long time to open a compressed file with 7-zip and how the "Opening File - Security Warning" message appears.
How the "Open File – Security Warning" message appears
When you run a file that you've downloaded from somewhere other than your PC, such as the Internet or an email attachment, Windows displays a security warning.
This is a security feature in Windows called "Mark of the Web (MOTW)."
To put it simply, it is like a "mark" that is attached to files downloaded from the Internet.
If a file is marked with this symbol, a warning will be displayed when you open it, and its functionality will be restricted until it is confirmed to be safe.
This plays an important role in protecting your computer from malicious files.
Why does it take so long to open a compressed file with 7-zip?
When you open a compressed file with 7-zip and it is marked, the Windows Security feature Microsoft Defender SmartScreen will be activated to check whether the file is safe.
What is Microsoft Defender SmartScreen?
Microsoft Defender SmartScreen is a cloud-based security feature from Microsoft that helps protect you from phishing scams and malware (malicious software).
It is primarily deeply integrated into the Microsoft Edge web browser and the Windows operating system.
So it takes a while to open.
This isn't a problem if the file size is small, but if the file size is several GB, it takes a very long time.
You can remove the "Mark of the Web (MOTW)" using the method on the next page, so please remove it only if you are sure that there is no problem with it.
Win10/Win11 Solution! "Windows protected your PC"
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