There is only one file type that uses the .OIF extension:
Origin Import Filter File
An OIF file is a data file used by Origin, a data analysis and graphing application used by various scientists and engineers. It contains import filter settings for files that are imported into Origin via the Import Wizard. OIF files also include post-import processing instructions in LabTalk Script.
OIF import filters are designed to allow users to save settings for importing different data types into Origin. When a user selects, he can choose to apply an import filter for the current data type.
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Updated: May 24, 2018