What needs to be specified in the “filename” argument in the command “compare using” or “repair using” (4296904)

The file used as argument in "compare using" or "repair using" used to be called config file  when these command first come out. Subsequently they were also called synchronization routing file. Nowadays they are called just "files". This article delves on various choices available when specifying such files Hereinafter for the sake of brevity we will only mention “compare using” in the document though it also applies to “repair using”. Likewise since the functionality also applies to repair,  all references to compare can be substituted with repair as appropriate.