Hi, Jing,
Let's backup a moment.
First, please confirm whether you are using GL8.x or GL9.0A or B and exactly which posting journal is needing to be cleared -- a current, prior year, provisional or unposting journal.
Second, when you say you 'found the data and changed the extension to whatever', exactly which file did you change the extension of?
Thanks.
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Regards,
Softrak Tech Support