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In V11.5 and later, the OPNRFILX() function has been modified so that, when it is called with a negative data file number, if the open fails, isam_fil is returned as a relative file number:
isam_fil = 0 indicates the data file open failed.
isam_fil = 1 indicates the first index open failed, etc.
Note: This feature is a Compatibility Change.
Prior to this change, OPNRFILX() set isam_fil to the file number that was not possible to open. However, it did not return useful information when it was called with a negative data file number, such as OPNRFIL(-1).
