For launching IEs as sort of "poor man's explorer" in RUNAS-Dosboxes (IE will inherit credentials, while explorer won't), I use the following 1-line-batch

perl -MFile::Spec::Functions -MCwd -MProc::Background -e "my $a=qq(@ARGV);$a = catfile(getcwd,$a) if $a!~/[\\\/]/;Proc::Background->new('C:\Program Files\Internet Explorer\IEXPLORE.EXE',$a)" %*

Proc::Background just serves as wrapper to Win32::Process to simplify the interface.

Using an applicable form of system as described above is of course a viable alternative.