Link: Warning lnk4089: all references to "shell32.dll" discarded by/OPT: ref

There is no problem in the debug version during VC compilation. One or more of the following warnings appear in the release version:
Link: Warning lnk4089: all references to "XXXX. dll" discarded by/OPT: ref,

Explanation: You have not introduced anything in XXX. dll. The linker does not link it for optimization, which helps reduce the size of intellectual files.

Solution: You don't need to worry about this warning. You can remove the warning as follows: add/opt to the end of project-> Project setting-> Link (Tab)-> project options: noref removes warnings.