By default, when importing data, ExcelWriter will not convert numeric strings to numbers. If
ConvertStrings is set to
true, ExcelWriter will parse the strings into a
decimal type by using the culture information specified through the ConversionCulture property. If no specific culture is explicitly set, the invariant culture will be used to parse the numeric string. Currently only the currencies and formatted numerals (such as numbers with the decimal and thousands delimiters) will be parsed into numbers. Percentage, date and time, exponents and hexadecimal representations won't be converted.