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..66ad9fb32ad 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
@@ -36,7 +36,8 @@
 import org.jetbrains.annotations.Unmodifiable;
 
 import java.io.IOException;
-import java.nio.charset.StandardCharsets;
+import java.io.UncheckedIOException;
+import java.nio.charset.Charset;
 import java.nio.file.*;
 import java.util.*;
 import java.util.stream.Stream;
@@ -224,33 +225,40 @@ public ResourcePackManager(GameRepository repository, String id) {
         this.optionsFile = repository.getRunDirectory(id).resolve("options.txt");
     }
 
+    @Nullable
+    private Charset optionsFileCharset;
+
     @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;
         }
+        optionsFileCharset = StringUtils.detectMaybeNativeTextEncoding(bytes);
+        new String(bytes, optionsFileCharset).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(), optionsFileCharset);
         } catch (IOException e) {
             LOG.warning("Failed to save instance options file", e);
         }
diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/StringUtils.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/StringUtils.java
index 533aaaab189..45df1dee6f8 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/StringUtils.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/StringUtils.java
@@ -17,12 +17,16 @@
  */
 package org.jackhuang.hmcl.util;
 
+import org.glavo.chardet.UniversalDetector;
 import org.jackhuang.hmcl.util.gson.JsonUtils;
+import org.jackhuang.hmcl.util.platform.OperatingSystem;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.Nullable;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.function.Predicate;
 import java.util.regex.Matcher;
@@ -630,6 +634,17 @@ public static List<String> deserializeStringList(String json) {
         return JsonUtils.fromNonNullJson(json, JsonUtils.listTypeOf(String.class));
     }
 
+    public static Charset detectMaybeNativeTextEncoding(byte[] data) {
+        var detector = new UniversalDetector();
+        detector.handleData(data);
+        detector.dataEnd();
+        var detected = detector.getDetectedCharset();
+        if (detected == null || !detected.isSupported()) return OperatingSystem.NATIVE_CHARSET;
+        var charset = detected.getCharset();
+        if (charset == StandardCharsets.UTF_8 || charset == StandardCharsets.US_ASCII) return StandardCharsets.UTF_8;
+        return OperatingSystem.NATIVE_CHARSET;
+    }
+
     public static class LevCalculator {
         private int[][] lev;
 
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 c583860bcc8..1fb1a0efc08 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
@@ -27,6 +27,7 @@
 import org.jetbrains.annotations.Nullable;
 
 import java.io.*;
+import java.nio.charset.Charset;
 import java.nio.file.*;
 import java.nio.file.attribute.BasicFileAttributes;
 import java.nio.file.attribute.PosixFileAttributeView;
@@ -507,13 +508,17 @@ public static Path tmpSaveFile(Path file) {
     }
 
     public static void saveSafely(Path file, String content) throws IOException {
+        saveSafely(file, content, 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 : UTF_8, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE)) {
             writer.write(content);
         }