Excel's Formula - sisman

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Part VI: Developing Custom Worksheet Functions
Figure 22-4: You see this warning when the VBA window is open and a workbook contains macros.
Saving Workbooks That Contain Macros
If you store one or more VBA macros in a workbook, you must save the file with macros enabled.
This is a file with an XLSM extension (or XLAM extension if it’s an add-in). This file format is not
the default format, so you need to make sure that you save the file with the correct extension.
For example, assume that you create a new workbook containing one or more macros. The first
time you save the workbook, the file format defaults to XLSX, which is a file format that cannot
contain macros. Unless you change the file format to XLSM, Excel displays the warning shown in
Figure 22-5. You need to click No, and then select Excel Macro-Enabled Workbook (*.xlsm) from
the Save as Type drop-down list.
Be careful because Excel makes it very easy to accidentally delete all your macros
with a single button click. If you accidentally click Yes instead of No, Excel deletes the
macros from the saved workbook. The macros are still available in the copy that you’re
working on, however. So if you catch your mistake, it’s still not too late to resave
the workbook with an XLSM extension.
Figure 22-5: Excel warns you if your workbook contains macros and you attempt to save it in a nonmacro
file format.