When one has no assemblies in Reflector it offers to select from one predefined assembly list. In the early-7 release this is only .Net 2 to 4, but not something like Silverlight.
If I have an unknown .dll I don't know what default assembly list it will need. Can I somehow find this out? In general, what .Net release should one pick? Or should one just always choose v4 or could this also have drawbacks?