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Seems like the concat option isn't working in Windows, when used with usemin, due to path issues. Same gruntfile works on osx/linux.
Thanks for the screenshot! I believe grunt.util has something I can use to detect the file system or figure out the usemin path.
I'll figure it out, but will probably need your help on it :)
Merge pull request #49 from torjue/master
Replace / with \\ in concat path on win32