Postinstall not working on Windows (sh not found)

[littleskunk]

https://github.com/Storj/storjshare-gui/blob/8a9cdd17bae2f40b1f5abb2e0096dfc8c2466424/package.json#L29

Der Befehl "sh" ist entweder falsch geschrieben oder
konnte nicht gefunden werden.

npm ERR! Windows_NT 10.0.14393
npm ERR! argv "C:\\Program Files (x86)\\nodejs\\node.exe" "C:\\Users\\Skunk\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "install"
npm ERR! node v4.4.6
npm ERR! npm  v2.15.8
npm ERR! code ELIFECYCLE
npm ERR! @ postinstall: `node ./tasks/app_npm_install && sh ./tasks/postinstall.sh`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ postinstall script 'node ./tasks/app_npm_install && sh ./tasks/postinstall.sh'.
npm ERR! This is most likely a problem with the  package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node ./tasks/app_npm_install && sh ./tasks/postinstall.sh
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!
npm ERR!     npm owner ls
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\storjshare-gui\npm-debug.log

I can still build binaries but it would be nice if you could remove the error message.