This is a naive answer, but it does what you asked for. But probably not what you need ...
What about typing *.class in the dialog box Ctrl + Shift + R?
There is one approach to this approach. Usually you do not see .class files there, because they are called derived resources (generated by Eclipse during compilation from your .java files). But you can also open the Ctrl + Shift + R dialog by setting the "Show derived resources" option in the configuration menu: 
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