Is there a Excel add-in to open specific number of file

[Ichabod]

Just wondering if there's an add-in that will let Excel open a numbers file.

[Raksha]

If you're referring to Numbers, part of iWork for Mac computers, I am not aware of such an add-in. The usual workaround is to use Numbers to save the file in a format that Excel can open.

[Don Of CS]

Each time you start Excel first displays the default workbook. Book 1, it contains three worksheets as follows: Sheet 1, Sheet 2, Sheet 3, which is shown at the bottom of the active workbook like this: Look at the bottom which is highlighted in red. This are the default files. It is not possible to hide the sheet but there are codes and there is a risk of file corruption.