diff --git a/gui/preload-main.js b/gui/preload-main.js
index 54e30553..57a3da86 100644
--- a/gui/preload-main.js
+++ b/gui/preload-main.js
@@ -715,10 +715,13 @@ var data = arg.data["DATA"]
         
         
         // write file to local folder
-
-require("fs").writeFile(arg.data[i]['RXDATA'][0]['filename'], arg.data[i]['RXDATA'][0]['data'], 'base64', function(err) {
-  console.log(err);
-});
+        var base64String = arg.data[i]['RXDATA'][0]['data']
+        //remove header from base64 String
+        var base64Data = base64String.split(';base64,').pop()
+        //write data to file
+        require("fs").writeFile(arg.data[i]['RXDATA'][0]['filename'], base64Data, 'base64', function(err) {
+            console.log(err);
+        });