How to read Cobol IDXFORMAT 8 files with FastLoad

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How to read Cobol IDXFORMAT 8 files with FastLoad

Hi.
Has anybody ever loaded idxformat 8 cobol files with FastLoad?
I have loaded idxformat 4 files succesfully but when reading the idxformat 8 files looks like the inmod doesnt know where a record ends and the other begins.

This is the first time I work with cobol files so any info you can give on this kind of files is appreciated

Thanks