diff --git a/src/main/java/org/ntlab/amaryllis/server/utils/Base64Decode.java b/src/main/java/org/ntlab/amaryllis/server/utils/Base64Decode.java
index c8b2860..87b212e 100644
--- a/src/main/java/org/ntlab/amaryllis/server/utils/Base64Decode.java
+++ b/src/main/java/org/ntlab/amaryllis/server/utils/Base64Decode.java
@@ -6,17 +6,17 @@
 
 public class Base64Decode {
         public static String saveAsFile(String vid ,String endata) throws IOException {
-            String path = Base64Decode.class.getResource("/data/" + vid+ ".mp4").getPath();
+            String path = Base64Decode.class.getResource("/data/" + vid+ ".3gp").getPath();
 
             //デコードを行う
             byte[] dedata = Base64.getDecoder().decode(endata);
 
             //ファイル作成
-            File file = new File("/data/" + vid+ ".mp4");
+            File file = new File("/data/" + vid+ ".3gp");
             file.createNewFile();
 
             //ファイルに音声データを書き込む
-            FileWriter file1 = new FileWriter("/data/" + vid+ ".mp4");
+            FileWriter file1 = new FileWriter("/data/" + vid+ ".3gp");
             PrintWriter pw = new PrintWriter(new BufferedWriter(file1));
             pw.println(dedata);