Something odd is happening for me on Windows 7 (64 bit). I have my own compiled 
copy of Vim, and when I run

:%!sparkup

I get "Shell returned 1" and the buffer is empty. Here, sparkup(.py) is a 
Python file - I have a .py file association and .py in my PATHEXT variable. The 
same command works fine when executed from a cmd.exe (or powershell) prompt.

In messing around trying to work out what is going on, I find that setting 
'shellxquote' to "( rather than its default of ( fixes the problem. And yet I 
see no reason why this should be necessary - other commands like tr a-z A-Z 
work fine, and if the vim default was wrong, I'm sure many more people than me 
would have had issues.

I'm not sure what on earth I can do to get any further with this - obviously I 
can simply set shellxquote and ignore the problem, but I'm worried that there 
may be some underlying issue that I really should address.

Paul

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