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There is no way to remove a compiler from compiler combobox. As user's allowed to add new compilers an action to remove compiler also should be provided. See also IZ 101635.
Despite now user can not add non-existing file to compilers it's allowed to add existing one but not a compiler. After that there is no way to remove dummy compiler and what even worse a new tab for this dummy compiler appears on the Code Assistance pane in the Tools->Options->C/C++. So I raise the priority of this bug to P1.
How does the lack of a Remove button impact a user enough to justify this as a P1? It does not break any user builds nor force the user to use a compiler they added and don't want. Unless I hear a good justification, I plan on lowering this to P3 and deferring it until a future release.
Fixed
verified in cnd 5.5.1u1 build (20070730)