3978 ChemStation Gas Chromatography/Mass Spectrum (GC/MS) Data File 2 Dataset ChemStation Gas Chromatography/Mass Spectrum (GC/MS) Version 2 Data File stores raw GC/MS data collected from Agilent ChemStation instruments. The format stores the data in a proprietary, binary format developed by Agilent Technologies. The files are organized in a folder structure with the suffix “.D” and often paired with .sav files to store the instrument tuning information and .res to store analysis results. The first few lines of the file may be in plain text and contain information about the analysis including the timestamp. 180 The National Archives and Records Administration / The National Archives and Records Administration 09 Jun 2026 09 Jun 2026 fmt/2101 PUID ms File extension 3467 GC/MS Data File 2 BOF; Offset: 0; Magic Bytes: version number indicator 0x01320000 followed by Magic Bytes 'GC / MS D(ata File|ATA FILE)' 1 Absolute from BOF 0 0 01320000114743202F204D532044(4154412046494C|6174612046696C65)