internet explorer - VS2012 breaks previously functioning .NET ActiveX object in IE 8 -

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(yes, work in large corporate environment, why i'm talking of backwards technology. no, don't have option gut thing , rewrite in decade's technology.)

we have application needs client-side work in .net, needs launched web application. way dev (working in 2004ish) chose have web site output tag points @ .net dll on server , launches winforms usercontrol inside of dll.

the html gets rendered in web page looks this:

<object id=launcher     classid=http://server.com/path/to/the.dll#full.namespace.path.to.theusercontrol  width=640 height=300 viewastext>   <param name="someparam" value="someparamvalue"> </object>

this working in production many years. now, when our developers install vs2012, stops working. after 2012 install, see user control rendered in box inside of ie page, see big x (like broken image). no other feedback given might problem. note true whether dev runs code locally, or runs on server deployed users (and working fine on machines don't have vs2012).

i'm having trouble diagnosing problem. there known issues vs2012 install (or .net 4.5 installed) impacting execution of activex controls in internet explorer (we using ie 8 if matters)? how should go finding out wrong?


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