Regression, [SHELL32] shlexec.cpp, RunDlg fails calling URL without http, because ShellExecCmdLine() rejects it to pass

Reproduction steps

• install Gecko during 2nd stage setup
• use the RunDlg from startmenu, which passes its parameters into [SHELL32] shlexec.cpp ShellExecCmdLine()
• type "www.google.de" without the quotes and without the preceeding http://

Expected result
Windows XP SP3 runs the default browser and displays the requested webpage

Observed result
On ros it displays a messagebox about the file not being found. That messagebox is generated by ShellExecCmdLine()
0.4.15-dev-1174-gde8d156_fails.webm
0.4.15-dev-1174-gde8d156_fails.log

P.S: I am aware that it would work as intended, if I had placed the http:// in front of it. But I did not, and it should still work.