In the context of the Nintendo Switch homebrew and emulation scenes, these acronyms refer to different ways the game's data is packaged:
Users with modified (CFW) Nintendo Switch consoles often use these files to store their library on a single large microSD card, eliminating the need to swap physical cartridges. The "Wonder" Experience Super Mario Bros. Wonder Switch NSP XCI GUNC...
Set to Vulkan (OpenGL causes significant shader stuttering on Windows). In the context of the Nintendo Switch homebrew
This is the format used for Nintendo Switch Project (NSP) files, which are the installation files for digital games downloaded from the Nintendo eShop. They are generally smaller than XCI files and are installed onto the Switch’s internal storage or SD card. They are generally smaller than XCI files and
An NVIDIA GTX 1060 or AMD RX 5700 equivalent is sufficient for 1080p rendering. Higher resolutions like 4K require an RTX 3060 or better.
The keyword is a hybrid of legitimate file format terms (NSP/XCI) and an unrecognized or corrupted tag (“GUNC”). While NSP and XCI are real formats for dumps of Nintendo Switch software, any reference to “GUNC” should be treated as suspicious or typographical noise.