You avoid the risk of bricking your console or catching a virus.
Are you trying to with a file you already have?
This indicates the file includes seven "Downloadable Content" expansions (new maps, scenarios, or trains). You avoid the risk of bricking your console
The official eShop version is optimized for the Switch hardware.
This confirms the software is the North American region version. You avoid the risk of bricking your console
You can back up your progress to Nintendo's servers.
These files do not work on a standard, "out of the box" Nintendo Switch. Your console must be running Custom Firmware (CFW) . You avoid the risk of bricking your console
This is the standard file format for Nintendo Switch digital packages (e.g., eShop games).