$ cat _testdir_\_test_.bat
@echo %date% %time%

$ cat runit.pl


use IPC::Run;
IPC::Run::run(['_testdir_/_test_.bat']);
IPC::Run::run(['_testdir_\\_test_.bat']) ;

$ perl runit.pl
'_testdir_' is not recognized as an internal or external command,
operable program or batch file.
Thu 05/27/2010  6:47:20.93

$ _testdir_\_test_.bat
Thu 05/27/2010  6:47:27.87

$ _testdir_/_test_.bat
'_testdir_' is not recognized as an internal or external command,
operable program or batch file.