If you are not replacing Windows Explorer with xplorer2 then you will be OK, I also use xplorer2 and like you I have done for years. In Options->Advanced I have a greyed out button Undo explorer replacement, but I can't remember how to do the replacement, its not something I ever entertained doing. Can't imagine Classic Shell would cause problems, too widely used, unless a recent update to it did something.
"STD template" probably refers to Save To Disk template.
BR
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