make 64bit PG for Windows

Author: ofTheo

frontend/package.json

@@ -20,7 +20,7 @@
     "build:osx": "electron-packager . $npm_package_productName --icon=static/icon/of.icns --out=dist --ignore='dist' --ignore='readme.md' --prune --overwrite --electron-version=0.30.0 --platform=darwin --arch=x64",
     "build:linux32": "electron-packager . $npm_package_productName --icon=static/icon/of.icns --out=dist --ignore='dist' --ignore='readme.md' --prune --overwrite --electron-version=0.30.0 --platform=linux --arch=ia32",
     "build:linux64": "electron-packager . $npm_package_productName --icon=static/icon/of.icns --out=dist --ignore='dist' --ignore='readme.md' --prune --overwrite --electron-version=0.30.0 --platform=linux --arch=x64",
-    "build:vs": "electron-packager . --icon=static/icon/of.ico --out=dist --ignore='dist' --ignore='readme.md' --prune --overwrite --electron-version=0.30.0 --platform=win32 --arch=ia32"
+    "build:vs": "electron-packager . --icon=static/icon/of.ico --out=dist --ignore='dist' --ignore='readme.md' --prune --overwrite --electron-version=0.30.0 --platform=win32 --arch=x64"
   },
   "files": [
     "index.html",