How to determine the format of the cell.
What values can return TFlxFormat.Format.
TFlxFormat.Format returns a string with the numeric format of the cell. the string is always in English, and it is a standard Excel formatting string.
But remember that you can always use APIMate to find out what a given format is. Just format the cell as you want in Excel, save the file, open it in APIMate, and it will tell you the numeric format you used.