Change "dir * \/b\/s" to be "cmd /C dir * \/b\/s"
Seems it can't work, got the following error: 
Execute Command: cmd /c dir * /b/s
[ERROR] (1) : Parameter format not correct - "s"".

[download]
And if I remove the parameters "/b/s" it stopped again.

In reply to Re^2: why IPC::Open3 can't execute MS-DOS "dir" command? by Anonymous Monk
in thread why IPC::Open3 can't execute MS-DOS "dir" command? by kiinoo

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