COMP-5 Field with value '1' is displayed differently in Data File Tools.
For example: If the field has a value of '1', the hex value in the flat file is  x'01000000', it is displayed as '016777216' in Data File Tools.
However, in mainframe, the hex value is x'00000001'.

Full article: https://portal.microfocus.com/s/article/KM000014865