UnityEX - unpack game files, search for specific textures, text, triggers etc.
AssetBundleExtractor - open main game DLL file to change scripts, options.
AssetStudioNet - open and look at specific textures, extract them, edit and import back.
I don't have any links at the time but those 3 programs are basically everything you might need when modding/translating the game. No other program needed and they are all free.

You are most likely going to use AssetStudioNet to texture related stuff.

Originally posted by 󠀡󠀡󠀡⁧⁧Lis:

UnityEX - unpack game files, search for specific textures, text, triggers etc.
AssetBundleExtractor - open main game DLL file to change scripts, options.
AssetStudioNet - open and look at specific textures, extract them, edit and import back.
I don't have any links at the time but those 3 programs are basically everything you might need when modding/translating the game. No other program needed and they are all free.

Thanks for helping . Can I please provide a link to download AssetStudioNet?

Originally posted by CMP:

Originally posted by 󠀡󠀡󠀡⁧⁧Lis:

UnityEX - unpack game files, search for specific textures, text, triggers etc.
AssetBundleExtractor - open main game DLL file to change scripts, options.
AssetStudioNet - open and look at specific textures, extract them, edit and import back.
I don't have any links at the time but those 3 programs are basically everything you might need when modding/translating the game. No other program needed and they are all free.

Thanks for helping . Can I please provide a link to download AssetStudioNet?

https://github.com/Perfare/AssetStudio/releases/download/v0.16.47/AssetStudio.net472.v0.16.47.zip

You need to open resources file in asset studio and then select 'Asset List' on the list on the top left corner. Click Gregg for image: [ibb.co]

Originally posted by 󠀡󠀡󠀡⁧⁧Lis:

You need to open resources file in asset studio and then select 'Asset List' on the list on the top left corner. Click Gregg for image: :Gregg: [ibb.co]

dude, what should you do if the sprite/texture has completely disappeared from the game? https://ibb.co/album/4KmQ7w

You need to tell me how you imported the edited texture back to the game, and also where from did you export it. This 'monument' texture is originally from 'sharedassets0' but can also be exported from 'resources.assets' without path id, which would probably create problems, like missing texture.
I stopped using all of those programs more than a year ago when i stopped working on my translation of the game so my knowledge is a bit dusty. You should try to find some answers on the internet. Night in The Woods is a 'unity game', so when you search tutorials for 'asset studio' just try to look for general help, not specifically for 'nitw' as all 'unity' games will have similar steps to modding.
My only guess for your specific problem is that there was some problems when importing, like wrong file extension or lack of path id.