This command will decompress ( -d ) the NSZ file, verify its integrity ( --verify ), and keep the resulting NSP file ( --keep-nsp ), using 4 CPU threads for speed ( --threads=4 ). Once the process is complete, you will have a usable .nsp file.
NCA files are used to store the actual game data, keys, and metadata. They are a crucial part of NSP files. the nsp file is missing a programtype nca hot