Hi Bob, At my last job we asked the outsourcer to implement extended format on our 'test' VSAM datasets. He implemented for all VSAM datasets. The company had some old source control system code written in assembler by some very clever consultants. Bottom line - the source control did not work due to the assembler code not recognizing the extended format. The change had to be backed out. For code written using standard API, I agree with you. Dave O'Brien
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