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There are following solutions to this problem:
There may be two QlikView entries in the Registry. Verify this by right clicking on a QlikView document in your file system > select open with > see if you have two QlikView applications listed, as displayed in the screenshot below. After removing the second apppication from registry, everything should wors fine.
That may be caused for a corrupt or incorrect entry in the Windows Registry. So if you have permissions to run the regedit.exe close all open QlikView programs opened (including Desktop and Plugin), run regedit.exe (start button, run, regedit), and browse the registry to the following key:
Right click on "qv" and select Export to make a backup, and save the REG file in the Desktop (for example). Then right click on System and delete it.
Open QlikView, close it, and double click on the QVW file. That should open the file just fine.
According to Microsoft KB article, this problem occurs due to Dynamic Data Exchange (DDE)feature. DDE is a type of communication protocols which is used by Windows to open certain filetypes which require this protocol for communication between source and target programs. DDE mechanism is used to prevent unnecessary opening of multiple instances of a program if one instance of that program is already running in background. So basically DDE helps Windows in saving computer resources so that you get better performance from your computer.
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