What's new in FastExcelReader 4: XLS support, custom column names, and 1.5× faster XLSX reading
aVadim
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23.07.2026
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FastExcelReader 4 reads the old XLS format (Excel 97–2003) through exactly the same methods you already use for XLSX — no second library, no branching in your code. withHeader() now accepts your own column names, and XLSX reading got about 1.5 times faster. A walkthrough of what version 4 brings.