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I converted program from IBX to IBDAC, replaced daIBExpress with daIBDAC in ReportBuilder report explorer as it shown in IBDAC demos

{x$DEFINE IBExpress} {remove the 'x' to enable Interbase Express}
{$DEFINE IBDAC} {remove the 'x' to enable Interbase Data Access Components}

{$IFDEF IBDAC}
daIBDAC,
{$ENDIF}

now I can create new report, preview it in designer, save it, but when I am trying to open it afterwards, I always receive the error "Invalid template format" The same is happening with all old reports, which worked fine with IBX.

Is it "build in" IBDAC luck of functionality of bug?

Unfortunately, we can't reproduce the issue.
To investigate this behavior of IBDAC, please compose a small sample demonstrating the issue and send it to us via form e-support:

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, including database objects creating scripts.