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API channelfileexcelexport is using module dyntools for the export to Excel while performing the export interactively in PSSE seems to use some other software. The Excel books created by the two methods are not identical.

Your problem is that dyntools in your revision of PSSE don't support .outx files, only .out files. You have to either upgrade to version 34.4 or save the simulation results in the older .out format.