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You can either:

1. Try 64-bit Excel. It supports more lines, but you will have to update the entire Office suite. Also, I never used PSSE with 64-bit Excel so I don't know whether it would work or not.

2. Export as CSV files instead, then use a good text editor to read/modify the CSV. CSV has no limit (but Excel probably cannot open it if lines are exceeded). Good text editors are : VSCode, Sublime, Atom, etc. You can use pandas and matplotlib to do the data processing/visualisation. Don't rely on Excel, it's not for science/engineering.