Call of Duty 4: .vision file

Create a new file in '[root]/raw/vision/' (create the 'vision' directory if it doesn't yet exists) called [mapname].vision, ignore any warnings that may come up when you save it with an unknown extension.

Open the .vision file you just created using Notepad, and copy-paste one of these and modify it to your needs.

Save it, and update your zone file with the following line:

rawfile,vision/[mapname].vision

The vision file should now be in effect.