SDF file is a binary file that SM32Pro generates by recording the scanned data.
The programs linked below are to convert the sdf files to text files without opening the SM32Pro.
1. SM301/SM301-EX spectrometers: SDF_TXT_CNVT_301.zip
2. All other SM spectrometers: SDF_TXT_CNVT_SMsExcept301.zip