at FastExcel.FastExcel.Read(Nullable`1 sheetNumber, String sheetName, Int32 existingHeadingRows)
at FastExcel.FastExcel.Read(String sheetName, Int32 existingHeadingRows)
at FastExcel.FastExcel.GetCellRangesByDefinedName(String definedName, Nullable`1 worksheetIndex)
Other application can open this file:
https://github.com/Smurf-IV/Excel_PRIME/blob/main/Performance.md#2025-11-25
And
File is here:
https://github.com/Smurf-IV/Excel_PRIME/blob/main/Excel_PRIME.Bench/Data/100mb.xlsx