fix #647 process argv for open-file for win and linux

src/ElectronNET.Host/main.js

@@ -18,6 +18,27 @@ let launchUrl;
 
 let manifestJsonFileName = 'electron.manifest.json';
 let watchable = false;
+
+// handle for opening the app with a file for win and linux
+if (process && process.argv.length > 1) {
+
+    let firstAppArgument = process.argv[1];
+
+    // With invoked via electronize, the first argument is the path to the main.js.
+    // Per issue #337, the /args switch can also be present. If either are present, 
+    // we need to check the subsequent argument.
+    if (firstAppArgument === '..\\..\\main.js' || firstAppArgument === '../../main.js' || firstAppArgument === '/args') {
+        if (process.argv.length > 2) {
+            firstAppArgument = process.argv[2];
+        }
+    }
+
+    // only append the first app arg if it is not already a switch
+    if (!firstAppArgument.startsWith("--")) {
+        app.commandLine.appendSwitch("open-file", firstAppArgument);
+    }
+}
+
 if (app.commandLine.hasSwitch('manifest')) {
   manifestJsonFileName = app.commandLine.getSwitchValue('manifest');
 }