Solution
The Excel Set Cell Format VI follows the Excel number formatting guidelines, not the LabVIEW string formatting guidelines.
Excel guidelines are as follows:
- # (number sign) - displays significant digits and does not display insignificant zeros.
- 0 (zero) - displays insignificant zeros if the number has fewer digits than there are zeros in the format.
- ? (question mark) - adds insignificant zeros on both sides of the decimal point to keep the decimal point aligned. The question mark can also be used for aligning fractions.
Table below shows some examples of basic Excel number formatting described above.

Figure below shows how this VI can be used to format the cells in the first 5 rows and 10 columns to always display two decimal places.

Note: To format the cell as text, use @ as the input for number format terminal.