Quick-and-dirty explanation of locator files:A locator file is a plain text file (the kind you can make with Notepad), except a locator file has the extension .locator instead of .txt.
For those who are new to this whole file-extension thing, here's one way to do it:
- Type the URL of the map into an empty notepad document. This should be the only thing in the document, and it should be only one line.
- Go to "File" > "Save As..."
- Change "Save As Type" from "Text Documents" to "All Files". You'll notice that, while "Text Documents" has a .txt next to it, "All Files" does not. This means that notepad will let us specify our own file extension.
- For the filename, type in the exact name of the map followed by ".locator". So if I just made "coolmap.png", then I'd name my locator file "coolmap.locator"
- Save it
You can always open the file later in notepad, even though Windows probably won't know what a .locator file is. Just open notepad, go to "File" > "Open..", change the "Text Documents" dropdown list to "All Files", and open the .locator.
You should also know that the filename in the URL doesn't have to match the filename of the locator and png files. You could upload coolmap.png to wwwDOTsomethingsomethingDOTwhatever/44959g2.png. If you type "wwwDOTsomethingsomethingDOTwhatever/44959g2.png" into "coolmap.locator", then GG2 will save the map as coolmap.png, not 22959g2.png.
See also: Dedicated Server and Custom Map Tutorials