what is the best and right way to patch a file in inno setup using xdelta

[maybeknow]

Originally Posted by Cesar82

ExtractTemporaryFile('XDelta3.dll');
ISxDeltaExtract(0, 0, 0, 640, ExpandConstant('{app}\test1.txt'), ExpandConstant('{tmp}\test1.txt.diff'), ExpandConstant('{app}\test_dest.txt'), false, false);

thank you again, but I still getting the same result...
I just using the ISDone.dll for the xdelta function, and im not using any other function