You cannot extract just the first part. You must download every part of the set (e.g., part1.rar , part2.rar , part3.rar , etc.) and place them all in the on your computer. Step 2: Extract the File
: Highly recommended for its simplicity; you can drag and drop files from your PC directly into an "SD Install" folder when connected via USB. L M [v0].nsp.part1.rar
How to Install NSP Files from SD card to the Nintendo Switch using Tinfoil!!! You cannot extract just the first part