diff --git a/brut.apktool/apktool-lib/src/main/java/brut/androlib/Androlib.java b/brut.apktool/apktool-lib/src/main/java/brut/androlib/Androlib.java
index 8630d1d0..15874860 100644
--- a/brut.apktool/apktool-lib/src/main/java/brut/androlib/Androlib.java
+++ b/brut.apktool/apktool-lib/src/main/java/brut/androlib/Androlib.java
@@ -30,6 +30,7 @@ import brut.directory.*;
 import brut.util.BrutIO;
 import brut.util.OS;
 import java.io.*;
+import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.logging.Logger;
 import java.util.regex.Pattern;
@@ -258,7 +259,11 @@ public class Androlib {
                 InputStream in = appDir.getDirectory().getFileInput("apktool.yml")
         ) {
             Yaml yaml = new Yaml();
-            return (Map<String, Object>) yaml.load(in);
+            Map<String, Object> result = (Map<String, Object>) yaml.load(in);
+            if (result.containsKey("unknownFiles")) {
+                result.put("unknownFiles", getUnknownFiles(result));
+            }
+            return result;
         } catch (DirectoryException | IOException ex) {
             throw new AndrolibException(ex);
         }
@@ -737,6 +742,15 @@ public class Androlib {
         return files;
     }
 
+    private static Map<String, String> getUnknownFiles(Map<String, Object> meta) {
+        Map<byte[], String> unknownFiles = (Map<byte[], String>) meta.get("unknownFiles");
+        Map<String, String> result = new LinkedHashMap<>();
+        for (Map.Entry<byte[], String> entry : unknownFiles.entrySet()) {
+            result.put(new String(entry.getKey(), StandardCharsets.UTF_8), entry.getValue());
+        }
+        return result;
+    }
+
     private final static Logger LOGGER = Logger.getLogger(Androlib.class.getName());
 
     private final static String SMALI_DIRNAME = "smali";
diff --git a/brut.apktool/apktool-lib/src/main/java/brut/androlib/ApkDecoder.java b/brut.apktool/apktool-lib/src/main/java/brut/androlib/ApkDecoder.java
index 0e6c424c..03febf48 100644
--- a/brut.apktool/apktool-lib/src/main/java/brut/androlib/ApkDecoder.java
+++ b/brut.apktool/apktool-lib/src/main/java/brut/androlib/ApkDecoder.java
@@ -377,7 +377,7 @@ public class ApkDecoder {
     }
 
     private void putUnknownInfo(Map<String, Object> meta) throws AndrolibException {
-        Map<String,String> info = mAndrolib.mResUnknownFiles.getUnknownFiles();
+        Map<byte[], String> info = mAndrolib.mResUnknownFiles.getUnknownFiles();
         if (info.size() > 0) {
             meta.put("unknownFiles", info);
         }
diff --git a/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResUnknownFiles.java b/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResUnknownFiles.java
index a337c1a2..5d6f79f2 100644
--- a/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResUnknownFiles.java
+++ b/brut.apktool/apktool-lib/src/main/java/brut/androlib/res/data/ResUnknownFiles.java
@@ -15,6 +15,7 @@
  */
 package brut.androlib.res.data;
 
+import java.nio.charset.StandardCharsets;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
@@ -23,13 +24,13 @@ import java.util.Map;
  */
 public class ResUnknownFiles {
 
-    private final Map<String, String> mUnknownFiles = new LinkedHashMap<String, String>();
+    private final Map<byte[], String> mUnknownFiles = new LinkedHashMap<byte[], String>();
 
     public void addUnknownFileInfo(String file, String value) {
-        mUnknownFiles.put(file,value);
+        mUnknownFiles.put(file.getBytes(StandardCharsets.UTF_8), value);
     }
 
-    public Map<String, String> getUnknownFiles() {
+    public Map<byte[], String> getUnknownFiles() {
         return mUnknownFiles;
     }
 }
diff --git a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
index 2098ee8d..f6c21e0e 100644
--- a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
+++ b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/apktool.yml
@@ -11,7 +11,8 @@ versionInfo:
   versionName: '1.0'
 compressionType: false
 unknownFiles:
-  hidden.file: '8'
-  stored.file: '0'
-  unk_folder/unknown_file: '8'
-  lib_bug603/bug603: '8'
\ No newline at end of file
+  !!binary "aGlkZGVuLmZpbGU=": '8'
+  !!binary "bm9uf3ByaW50YWJsZS5maWxl": '8'
+  !!binary "c3RvcmVkLmZpbGU=": '0'
+  !!binary "dW5rX2ZvbGRlci91bmtub3duX2ZpbGU=": '8'
+  !!binary "bGliX2J1ZzYwMy9idWc2MDM=": '8'
\ No newline at end of file
diff --git "a/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/non\177printable.file" "b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/non\177printable.file"
new file mode 100644
index 00000000..e4a49202
--- /dev/null
+++ "b/brut.apktool/apktool-lib/src/test/resources/brut/apktool/testapp/unknown/non\177printable.file"
@@ -0,0 +1 @@
+This file's name contains a non-printable character.
\ No newline at end of file