now only allowing images to be the taget of an img source

src/Ation.js

@@ -1,6 +1,7 @@
 "use strict";
 const {app, protocol} = require("electron");
 const url             = require("url");
+const path            = require("path");
 
 const WindowManager = require("./WindowManager");
 
@@ -14,8 +15,11 @@ class Ation {
 
 		app.whenReady().then(async () => {
 			protocol.registerFileProtocol("slideimg", (request, callback) => {
-				const path = request.url.replace(/^slideimg:\/\//, "");
-				callback(path);
+				const uri       = request.url.replace(/^slideimg:\/\//, "");
+				const extension = path.extname(uri).replace(/^\./, "");
+
+				if (["png", "jpg", "jpeg", "svg", "bmp", "gif", "tiff"].includes(extension.toLowerCase()))
+					callback(uri);
 			});
 		});
 	}