Switch -N<file> - include only the specified file
Include only the specified file. Wildcards may be used both in the name and file parts of file mask. You may specify the switch '-n' several times. This switch does not replace usual file masks, which still need to be entered in the command line. It is an additional filter limiting processed files only to those matching the include mask specified in -n switch. It can help to reduce the command line length sometimes.
For example, if you need to compress all *.txt and *.lst files in folders Project and Info, you can enter:
WinRAR a -r text Project\*.txt Project\*.lst Info\*.txt Info\*.lst
or using the switch -n:
WinRAR a -r -n*.txt -n*.lst text Project Info