On widows file paths will include `\` instead of `/` and `source-map` doesn’t convert slashes, but source map will work only with UNIX slashes. We can fix it in app, but I think, that we need to fix it here, because every `source-map` node.js user must to repeat this fix. Autoprefixer issue: https://github.com/nDmitry/grunt-autoprefixer/issues/25 I can helps with PR, but how we should do this? Try to load `path` (it wil be in node.js and browserfy) and if `path.sep == "\\"` replace all `\` to `/`?