"Invalid type library" error when opening Excel via ActiveX

[Stefan Borg]

Hi,
I am trying to open Excel via ActiveX (Automation open function), for
instance by running the
build in example "Open Excel and make visible". However, on some computers,
I recieve the error code -2147319784 "Old format or invalid type library".
The problem seems to be that LabView is unable to recognize the ActiveX
control, as it does not appear in the list "Select ActiveX Class". It works
perfecly from Matlab though, so the control seem to be in order. I have also
tried reinstalling Office.
On most computers it works perfectly, but three identical Dell P4 900Mhz
have the same problem.

/Stefan Borg

[Gorka Larrea]

This may be happening due to different Excel versions, a vi made to control Excel 97 won't work for Excel 2000 and vice-versa. Be sure you are using the correct activeX calls for each one.
Good luck