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Asked: 2026-05-15T10:45:24+00:00

I have a Silverlight application that I can run from Internet Explorer 8. When

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I have a Silverlight application that I can run from Internet Explorer 8.
When I attempt to host it in a Winforms browser control as described here: Silverlight Hosted in Winforms it display a web page that says “To view this content, please install” and has a “Click now to install” button.

Unfortunately, SL4 is already installed. However I did try to follow the instructions. But was prompted, of course, that SL4 was already installed on my system.

I seems that at one spot IE/Silverlight cannot see that Silverlight runtime is installed, but at anoter spot it can see it. This has become a significant roadblock.
The client OS is Win 7 64-bit. I have no idea if other versions of OS are exhibiting the same problem.

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  1. Editorial Team

    Silverlight (the plugin) is 32-bit only. You can not run it from a 64-bit application.

    If you can [easily] force the application to run in a 32-bit context, then you’re in luck — change the “target” of the VS project from “Machine Independent” to “x86”.

    The above situation describes exactly what I ran into when trying to run SL (32-bit) in a Windows Sidebar Gadget (default 64-bit on Windows 7 64-bit); this is somewhat interesting, it implies that all (or at least almost all of) the components behind IE are 64-bit ready. The “holdup” and why IE normally only runs in 32-bit is that it’s a chick-and-egg problem with all the plugins, BHOs, and ActiveX components used. However, the (IE) Browser Host will happily run as 64-bit.

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