Installation ConsiderationsA COM Add-in is an ActiveX DLL that needs to be registered on the computer before it can be used. The registration is done by a program called regsvr32.exe, usually found in the C:\Windows\System32 directory. The easiest way to do it manually is to right-click the DLL, choose Open With… and browse to the regsvr32.exe file. You can also use the Add… button on Excel's COM Add-ins dialog and browse to the DLL. A final alternative is to use a setup program, which should automatically register any ActiveX DLLs it installs.Initial Load Behavior to None and use the Advanced tab to add our own registry entries, as shown in Figure 21-6. Note that the LoadBehavior value is a DWORD type, whereas the other two are strings. Figure 21-6. The Advanced Tab of the Designer Dialog, Showing the Entries for an All-User Installation COM Add-ins that are installed in this way do not show up in the COM Add-ins dialog and can only be uninstalled by deleting the registry entries using regedit (which you might want to do right now!). They will also obviously require access to the HKLM section of the registry, which is usually only granted to people in the Power Users or Administrators network groups. Members of the basic Users group will not be able to install (or uninstall) the add-in. |
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