diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/addon/resourcepack/ResourcePackManager.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/addon/resourcepack/ResourcePackManager.java
index d571f6422cf..5799909e92f 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/addon/resourcepack/ResourcePackManager.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/addon/resourcepack/ResourcePackManager.java
@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.addon.resourcepack;
 
 import com.google.gson.annotations.SerializedName;
+import kala.encdet.EncodingDetector;
 import org.jackhuang.hmcl.game.GameRepository;
 import org.jackhuang.hmcl.addon.LocalAddonManager;
 import org.jackhuang.hmcl.addon.meta.PackMcMeta;
@@ -36,6 +37,8 @@
 import org.jetbrains.annotations.Unmodifiable;
 
 import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.*;
 import java.util.*;
@@ -224,33 +227,46 @@ public ResourcePackManager(GameRepository repository, String id) {
         this.optionsFile = repository.getRunDirectory(id).resolve("options.txt");
     }
 
+    private @Nullable Charset optionsFileEncoding;
+
     @NotNull
     private Map<String, String> loadOptions() {
         getMinecraftVersion();
         Map<String, String> options = new LinkedHashMap<>();
         if (!Files.isRegularFile(optionsFile)) return options;
-        try (var stream = Files.lines(optionsFile, StandardCharsets.UTF_8)) {
-            stream.forEach(s -> {
-                if (StringUtils.isNotBlank(s)) {
-                    var entry = s.split(":", 2);
-                    if (entry.length == 2) {
-                        options.put(entry[0], entry[1]);
-                    }
-                }
-            });
-        } catch (IOException e) {
+        byte[] bytes;
+        try {
+            bytes = Files.readAllBytes(optionsFile);
+        } catch (IOException | UncheckedIOException e) {
             LOG.warning("Failed to read instance options file", e);
+            return options;
         }
+
+        EncodingDetector.Encoding bestEncoding = EncodingDetector.MODERN_WEB.detect(bytes).bestEncoding();
+        if (bestEncoding == EncodingDetector.Encoding.ASCII)
+            bestEncoding = EncodingDetector.Encoding.UTF_8;
+
+        optionsFileEncoding = bestEncoding != null && bestEncoding.approximateCharset() != null
+                ? bestEncoding.approximateCharset() : StandardCharsets.UTF_8;
+        //noinspection DataFlowIssue
+        new String(bytes, optionsFileEncoding).lines().forEach(s -> {
+            if (StringUtils.isNotBlank(s)) {
+                var entry = s.split(":", 2);
+                if (entry.length == 2) {
+                    options.put(entry[0], entry[1]);
+                }
+            }
+        });
         return options;
     }
 
     private void saveOptions(@NotNull Map<String, String> options) {
+        StringBuilder sb = new StringBuilder();
+        for (var entry : options.entrySet()) {
+            sb.append(entry.getKey()).append(":").append(entry.getValue()).append(System.lineSeparator());
+        }
         try {
-            StringBuilder sb = new StringBuilder();
-            for (var entry : options.entrySet()) {
-                sb.append(entry.getKey()).append(":").append(entry.getValue()).append(System.lineSeparator());
-            }
-            FileUtils.saveSafely(optionsFile, sb.toString());
+            FileUtils.saveSafely(optionsFile, sb.toString(), optionsFileEncoding);
         } catch (IOException e) {
             LOG.warning("Failed to save instance options file", e);
         }
@@ -277,7 +293,8 @@ public PackMcMeta.PackVersion getRequiredVersion() {
         if (requiredVersion == null) {
             lock.lock();
             try {
-                if (requiredVersion == null) requiredVersion = getPackVersion(getMinecraftVersion(), repository.getVersionJar(id));
+                if (requiredVersion == null)
+                    requiredVersion = getPackVersion(getMinecraftVersion(), repository.getVersionJar(id));
             } finally {
                 lock.unlock();
             }
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/FileUtils.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/FileUtils.java
index b7df7c80946..c90680b57c3 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/FileUtils.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/io/FileUtils.java
@@ -25,6 +25,8 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.io.*;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.*;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.attribute.PosixFileAttributeView;
@@ -486,13 +488,17 @@ public static Path tmpSaveFile(Path file) {
     }
 
     public static void saveSafely(Path file, String content) throws IOException {
+        saveSafely(file, content, StandardCharsets.UTF_8);
+    }
+
+    public static void saveSafely(Path file, String content, @Nullable Charset charset) throws IOException {
         Path parent = file.toAbsolutePath().getParent();
         if (parent != null) {
             Files.createDirectories(parent);
         }
 
         Path tmpFile = tmpSaveFile(file);
-        try (BufferedWriter writer = Files.newBufferedWriter(tmpFile, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE)) {
+        try (BufferedWriter writer = Files.newBufferedWriter(tmpFile, charset != null ? charset : StandardCharsets.UTF_8, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE)) {
             writer.write(content);
         }