Final answer:
The 'Windows open file warning' is a security feature to prevent running potentially unsafe files from unknown sources. To resolve this error, you can unblock the file in its properties if you trust its source. For persistent warnings, check your Internet security settings or the file's safety with an antivirus program.
Step-by-step explanation:
The 'Windows open file warning', also known as the Open File - Security Warning dialog box, is a security feature in Windows operating systems. It appears when you try to open a file that has been downloaded from the internet or another potentially unsafe source, or when you run an application that Windows doesn't recognize as safe. This warning helps protect your computer from malware and unauthorized changes by prompting you to confirm that you trust the file before opening it.
Solution to 'Windows open file warning'
Right-click the file and select 'Properties'.
At the bottom of the Properties dialog, there is a checkbox saying 'Unblock'. Check this box.
Click 'Apply', then 'OK' to close the dialog.
If you trust the source of the file, you can now open it without seeing the warning.
If the warning persists, you may need to adjust your Internet security settings or consider evaluating the file with updated antivirus software to ensure it's safe. However, always be cautious and make sure the source of the file is trustworthy before making any changes to your security settings.