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You should review the GDSII file format for the exact details. There are links here to some documentation: GDSII - WikipediaOther than the file extension you can look in the header of the file. My understanding is a GDSII file will always have a header which is 00 06 00 02 and 2 bytes for the version v3 (00 03) or v4 (00 04) or v5 (00 05) or v0 (00 00) or v6 (02 58). These values are in HEX. Then 2 bytes for the next record size and usually start with Begin Library (01 02) record.