running a command in a directory using std.process

[Benjamin Thaut]

As far as I can tell std.process can only run commands in the working 
directory of the currently executing function. I want to execute a 
certain program inside a subdirectory on windows and can't get it to work:

myproject
 |- subdir
So my executable has "myproject" as working directory. And I want to 
execute "dmd" with "subdir" as working directory.
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Kind Regards
Benjamin Thaut