Nullsoft Scriptable Install System
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NSIS (Nullsoft Scriptable Install System) is an open source system to create Windows installers. NSIS is script-based and although it has regular and well defined syntax, there are no magic numbers or header sequences. As such, there is no current means to identify a file as NSIS by binary sequence alone, so identification of this format is by extension only.
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From PRONOM, Wikidata. Updated 2026-10-20.