Updated: April 12, 2026
How it works: When the game detects an older processor, it automatically switches to a fallback executable (u4-l.exe for Uncharted 4 or tll-l.exe for The Lost Legacy).
PC gaming’s greatest strength is its backwards compatibility. While Naughty Dog failed to accommodate legacy hardware, the community’s Uncharted 4 AVX2 fix ensures that no one has to upgrade their CPU just to play a six-year-old console port.
: These fallback executables use standard instruction sets or original AVX paths to perform the floating-point computations that were previously locked to AVX2. Preserved High-End Performance