You have to recreate the alternate data stream for the file. The easiest way to do this is by using Notepad. Run cmd.exe and navigate to the directory that contains the file. I'll use test.txt as an example, type this command:
Notepad "test.txt:Zone.Identifier"
Double quotes required. Notepad prompts you to create a new file, click Yes. Paste or write this:
[ZoneTransfer]
ZoneId=3
Press Ctrl+S to save.