@SimGuruModSquad What Files Make Up The Sims 4 Worlds?

@SimGuruModSquad Ive been going through the resource files for get together and have been replacing the ground textures however im missing one texture , is it possible to get the instances of these ground textures ?
http://40.media.tumblr.com/0037e0e7e23d792f6f7547f278a1915b/tumblr_nz4updXMkV1tjf6nno1_1280.png

kiwisims4.tumblr.com/post/134846209077/wip-get-together-grass-replacement-this-is-still