FSH-2366 describes a case where too many command line arguments are passed to the p4 client, causing an error in Windows (CreateProcess error=87, The parameter is incorrect).

Windows has a limit to the length of command line when creating a process: What is the command line length limit?

We should pass the arguments to p4 via the -x flag: http://www.perforce.com/perforce/doc.current/manuals/cmdref/o.gopts.html