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I just installed windows 7 on every computer on my network, and I am only having a problem with one form. I still have an old Windows XP machine and I can access that form from that computer. I don't understand why one form doesnt work but the rest of the omniforms work.
Search for the missing DLL file using search option in windows explorer. Copy the same to system32 folder and register the same using regsvr32 command. e.g.: type regsvr32 XXXX.dll in Run command. Revert back for more clarifications or assistance required.
The Extend.dat file is an information file created by outlook to store some small, usually useless information. It is located in a folder that's usually buried and hidden on most Windows PC's. Try this.
Close Outlook, and all other office related products.
Open your control panel.
Find the entry called mail. You may have to select the classic view on the left to be able to see this icon.
You should now see something like this image:
Click on data files. You should see something like this:
Now click on open Folder. This will take you to that secret and hidden place on your hard drive that contains you out data files. You should see a files called extend.dat in there. If you do, delete it and reopen outlook. If you don't, then you may have to destroy your outlook profile and recreate it.
Comment back here on if this fixedya, or if I need to help you recreate the profile. If I'm going to help you recreate the profile, you'll need to at a minimum know who your hosting your email through.