The .rar extension indicates that the game files are compressed. You cannot install a .rar file directly onto a Nintendo Switch. : Use software like 7-Zip or WinRAR on your PC.
To play these files, your Nintendo Switch must be modified to run custom firmware (CFW). Coloring Pages Lumberhill Tales [2DLC][US] NSP.rar
is a digital coloring book based on the multiplayer party game Lumberhill . Coloring Pages Lumberhill Tales [2DLC][US] NSP.rar
: Copy the extracted .nsp files to an "NSPs" folder on your SD card, then use Goldleaf to browse and install them. Coloring Pages Lumberhill Tales [2DLC][US] NSP.rar