Compressing files with WinRar command-line - files in use

Question

I am using this simple command to zip files into an archive with WinRar.

winrar a -afzip -ep1 "C:\ok.zip" "C:\ok"

But if something is running (for example a simple .exe) from that directory it gives me error:

"The process cannot access the file because it is being used by another process."

Is there any switch that would compress even the files in use.

I am sticking with WinRar as my customer has recommended it.

But would like your recommendations too, but don't think customer is going to let me use anything else.

Solution

-DH, according to http://acritum.com/software/manuals/winrar/

I've not checked official manual, search for it.