Assuming that the file is available when you try to access it (i.e. the creation goes well) the RadWindow should be able to load it just like any iframe would.
A possible reason why the RadWindow would not open in this scenario would be if this event is fired in an AJAX request where the RadWindow is not updated in the response. This means that the VisibleOnPageLoad property and the new url will not be sent to the client.
+ url +
"\", \"RadWindow1\"); Sys.Application.remove_load(f);}Sys.Application.add_load(f);"
More information about this approach is available in this help article
All the best,
the Telerik team
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