An .xci file is a type of file used by the Nintendo Switch console for game cartridges. It's essentially a container format that includes the game data.

For enthusiasts looking to archive, emulate, or research the game's file structure, the specific release identifier represents a standardized cartridge dump of this historic release. Technical Specifications & Identifier Breakdown

Must be extracted from a hacked console and match or exceed the firmware version required by FIFA 18 (Firmware 3.0.1 or higher).

Downloading copyrighted software images without owning the physical cartridge violates intellectual property rights and digital copyright laws in most international jurisdictions.

Modifying your console or using files from unverified sources can expose your device to malware and potentially render it unusable.

To enjoy FIFA 18 on your Switch safely, purchase a pre-owned physical cartridge from a reputable local gaming store or online marketplace. You can then use legally acquired homebrew tools on an offline console to dump your own personal cartridge image for archival purposes.