Posted by ravas on Mar 22, 2016; 5:02pm
URL: https://forum.librecad.org/IMPORT-DXF-AND-NOT-SHOWING-BLOCKS-tp5712796p5713382.html

I can't say for sure, but I did find this in drw_base.h

namespace DRW {

//! Version numbers for the DXF Format.
enum Version {
    UNKNOWNV,     /*!< UNKNOWN VERSION. */
    AC1006,       /*!< R10. */
    AC1009,       /*!< R11 & R12. */
    AC1012,       /*!< R13. */
    AC1014,       /*!< R14. */
    AC1015,       /*!< ACAD 2000. */
    AC1018,       /*!< ACAD 2004. */
    AC1021,       /*!< ACAD 2007. */
    AC1024,       /*!< ACAD 2010. */
    AC1027        /*!< ACAD 2013. */
};