This is a compressed archive file. The .nsp is likely packed inside to make the download size smaller. Usage and Context

The string [0100726014352800][v1310720] is a standard naming convention used in the Switch homebrew and piracy communities to identify specific game data:

This is the Title ID for Diablo II: Resurrected on the Nintendo Switch.

This represents the Version Number of the game. In the Switch's internal numbering, v1310720 typically corresponds to a significant update or patch (like Patch 2.4 or later).