diff --git a/_cache_service_worker.js b/_cache_service_worker.js
index 4e492f5..ec49986 100644
--- a/_cache_service_worker.js
+++ b/_cache_service_worker.js
@@ -6,7 +6,7 @@
 */
 
 var PRECACHE_ID = 'rom-patcher-js';
-var PRECACHE_VERSION = 'v30rc2b';
+var PRECACHE_VERSION = 'v30rc2c';
 var PRECACHE_URLS = [
 	'/RomPatcher.js/', '/RomPatcher.js/index.html',
 	'/RomPatcher.js/manifest.json',
diff --git a/rom-patcher-js/RomPatcher.webapp.js b/rom-patcher-js/RomPatcher.webapp.js
index c19be11..7cbf8e2 100644
--- a/rom-patcher-js/RomPatcher.webapp.js
+++ b/rom-patcher-js/RomPatcher.webapp.js
@@ -508,6 +508,15 @@ var RomPatcherWeb = (function () {
 		return false;
 	}
 
+	const _dragEventContainsFiles = function (evt) {
+		if (evt.dataTransfer.types) {
+			for (var i = 0; i < evt.dataTransfer.types.length; i++) {
+				if (evt.dataTransfer.types[i] === 'Files')
+					return true;
+			}
+		}
+		return false;
+	}
 	const _initialize = function (newSettings, embededPatchInfo) {
 		/* embeded patches */
 		var validEmbededPatch = _checkEmbededPatchParameter(embededPatchInfo);