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How to display a .ll preview file with the Html5Viewer in a web browser

We can use the Html5Viewer to create and display NEW reports in a web browser by using the documented methods: in the OnListLabelRequest event a new ListLabel object is created, a dataprovider assigned and returned to the viewer by the ListLabelRequestEventArgs parameter.

We would now like to display previously created reports with the viewer that have been saved as a .LL preview file on the web-server disk.
How can we achieve this with LL20 (or upwards)? How do we need to set up the OnListLabelRequest event to do this?
Thank you for your help.

Unfortunately, the browser vendors have more and more deprecated the usage of rich browser controls, obviously due to security concerns. You may still use the viewer OCX in the Internet Explorer, however we’d advise to either convert the preview files to PDF (as most browsers come with a PDF plugin) or, alternatively, install the viewer application on the client side, if required.