If it's just a mapfile, then you can place it anywhere on your computer. However, a modfile must be inside the "Starcraft II/Mods" folder, and if there are several maps which load automatically after one has ended (campaign), then they also must be placed inside the Maps folder as instructed.
That is because all the data is referenced in relation to the folder structure, so ideally everything has to be inside the Starcraft II folders.
Here is a video that shows the entire process of installing a custom campaign:
(Here's a direct link in case you don't have Flash installed:
Lastly, you don't always need to load a map inside the editor in order to play it. There is an alternative way.
Go to Starcraft II/Support folder and find "SC2Switcher.exe". Drag & Drop any mapfile onto that executable and it will start the game with the map automatically.
If you create a shortcut for it on the desktop, you can drag & drop files onto that as well, which is a lot faster than starting the editor every time.
If it's just a mapfile, then you can place it anywhere on your computer. However, a modfile must be inside the "Starcraft II/Mods" folder, and if there are several maps which load automatically after one has ended (campaign), then they also must be placed inside the Maps folder as instructed.
That is because all the data is referenced in relation to the folder structure, so ideally everything has to be inside the Starcraft II folders.
Here is a video that shows the entire process of installing a custom campaign:
(Here's a direct link in case you don't have Flash installed:
Lastly, you don't always need to load a map inside the editor in order to play it. There is an alternative way.
Go to Starcraft II/Support folder and find "SC2Switcher.exe". Drag & Drop any mapfile onto that executable and it will start the game with the map automatically.
If you create a shortcut for it on the desktop, you can drag & drop files onto that as well, which is a lot faster than starting the editor every time.