Open git shell directly from "GitHub for Windows" (GH4W).

Git Shell.ahk

#NoEnv
#NoTrayIcon
#SingleInstance, Off
EnvGet, AppData_Local, LOCALAPPDATA
if !StrLen(AppData_Local)
	if InStr(p := A_AppData,"\roaming")
		AppData_Local:=SubStr(p,1,-8) "\Local"
	else
		ExitError("Could not find 'Local AppData'.")

WrkDir:=A_MyDocuments
if FileExist(p:=WrkDir "\GitHub")
	WrkDir:=p

AppRef := AppData_Local "\GitHub\GitHub.appref-ms"
;######### ENV DATA - INITIALISATION END #########

run, %AppRef% --open-shell, %WrkDir%, UseErrorLevel
if ErrorLevel
	ExitError("Could not launch. Error code: " A_LastError)

ExitError(txt) {
	MsgBox, 16, %A_ScriptName% Error, % txt
	ExitApp
}