Hallo Michael,
ich denke da hilft Dir dies:

Office 2007
1 Click on the Office button (the large circle at the top left of the application.)
2 Click on the Excel Options button.
3 In the resulting dialog, click on Add-Ins to view the installed add-ins for Excel.
4 Near the bottom of the dialog, there is a pull-down box of items to manage. Ensure Excel Add-ins is selected, and click on the Go button.
5 In the resulting dialog, click on the Browse button.
6 Navigate to the installation path of iSeries Access (which is typically C:\Program Files\IBM\Client Access).
7 Double-click on the Shared folder.
8 Double-click on the cwbtfxla.xll file.
9 Click the OK button. The toolbar buttons for the Excel Add-In should now be displayed.