Issue #9435 has been reported by wind winy.

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Backport #9435: Kernel.system problem
https://bugs.ruby-lang.org/issues/9435

* Author: wind winy
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
* ruby -v: 2.0.0
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if ENV['PATH'] include double quotes, Kernel.system cann't find it.

windows OS, open a cmd window

`
set PATH="C:\Program Files\7-Zip";%PATH%
7z -h  # can run it

pry
system '7z -h'   # cann't find 
`

and, if command include double quotes, system cann't find too.
`
system '"C:\Program Files\7-Zip\7z" -h'  # ok
system '"C:\Program Files\7-Zip"\7z -h'  # cann't find
system '"C:\Program Files\7-Zip\"7z -h'  # cann't find
`





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