It worked correctly here...
//echo -a --> $sfile(*.exe,Choose the executable file of your media player)
--> C:\Programme\iTunes\itunes.exe
//echo -a --> $msfile(*.exe,Choose the executable file of your media player) $msfile(1)
--> 1 C:\Programme\iTunes\itunes.exe
v6.31 - XP Pro SP2 - NTFS
~ Edit ~
...should be moved to bug reports section.
I would agree, if it were a problem with mIRC.