In this article I will explain with an example, how to resolve the error: Couldn't process file Form1.resx due to its being in the Internet or Restricted zone or having the mark of the web on the file.
Cause
The following error occurs, when you download the project from Internet or the file came from another computer.
Solution
In order to resolve the error, follow the below steps.
1. Right click on the Solution Explorer and click on Open Folder in File Explorer option from the context menu.
2. Once the File Explorer is opened, navigate to project/solution directory. Search for file with extension .resx.
Once found, Right click on the resx file and click on Properties option from the context menu.
3. Now, inside the Properties window, look for Security option and check (select) the Unblock CheckBox.
4. Finally, click on Apply and then OK.
Repeat Step 3 and 4 for each resx files and reopen the project.
