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What is a CTEX file?
Donkey Kong Country Tropical Freeze is a platforming game available for the Nintendo Wii U and Switch. Retro Studios released the Wii U version of Donkey Kong Country Tropical Freeze in 2014 and the Switch version in 2018.
Both versions of Donkey Kong Country Tropical Freeze use textures saved as CTEX files. However, the Wii U version's CTEX files are compressed using LZSS compression, while the Switch version's are compressed using zlib compression.
How to open a CTEX file
CTEX files are not meant to be opened. Donkey Kong Country Tropical Freeze loads CTEX files when players play the game.