diff --git a/source/funkin/util/FileUtil.hx b/source/funkin/util/FileUtil.hx
index c30eacba8..3494e620b 100644
--- a/source/funkin/util/FileUtil.hx
+++ b/source/funkin/util/FileUtil.hx
@@ -18,7 +18,7 @@ class FileUtil
   /**
    * Browses for a single file, then calls `onSelect(path)` when a path chosen.
    * Note that on HTML5 this will immediately fail, you should call `openFile(onOpen:Resource->Void)` instead.
-   * 
+   *
    * @param typeFilter Filters what kinds of files can be selected.
    * @return Whether the file dialog was opened successfully.
    */
@@ -26,9 +26,9 @@ class FileUtil
       ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = convertTypeFilter(typeFilter);
+    var filter:String = convertTypeFilter(typeFilter);
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSelect != null) fileDialog.onSelect.add(onSelect);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
@@ -46,7 +46,7 @@ class FileUtil
   /**
    * Browses for a directory, then calls `onSelect(path)` when a path chosen.
    * Note that on HTML5 this will immediately fail.
-   * 
+   *
    * @param typeFilter TODO What does this do?
    * @return Whether the file dialog was opened successfully.
    */
@@ -54,9 +54,9 @@ class FileUtil
       ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = convertTypeFilter(typeFilter);
+    var filter:String = convertTypeFilter(typeFilter);
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSelect != null) fileDialog.onSelect.add(onSelect);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
@@ -74,16 +74,16 @@ class FileUtil
   /**
    * Browses for multiple file, then calls `onSelect(paths)` when a path chosen.
    * Note that on HTML5 this will immediately fail.
-   * 
+   *
    * @return Whether the file dialog was opened successfully.
    */
   public static function browseForMultipleFiles(?typeFilter:Array<FileFilter>, ?onSelect:Array<String>->Void, ?onCancel:Void->Void, ?defaultPath:String,
       ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = convertTypeFilter(typeFilter);
+    var filter:String = convertTypeFilter(typeFilter);
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSelect != null) fileDialog.onSelectMultiple.add(onSelect);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
@@ -101,7 +101,7 @@ class FileUtil
   /**
    * Browses for a file location to save to, then calls `onSelect(path)` when a path chosen.
    * Note that on HTML5 you can't do much with this, you should call `saveFile(resource:haxe.io.Bytes)` instead.
-   * 
+   *
    * @param typeFilter TODO What does this do?
    * @return Whether the file dialog was opened successfully.
    */
@@ -109,9 +109,9 @@ class FileUtil
       ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = convertTypeFilter(typeFilter);
+    var filter:String = convertTypeFilter(typeFilter);
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSelect != null) fileDialog.onSelect.add(onSelect);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
@@ -129,36 +129,36 @@ class FileUtil
   /**
    * Browses for a single file location, then reads it and passes it to `onOpen(resource:haxe.io.Bytes)`.
    * Works great on desktop and HTML5.
-   * 
+   *
    * @param typeFilter TODO What does this do?
    * @return Whether the file dialog was opened successfully.
    */
   public static function openFile(?typeFilter:Array<FileFilter>, ?onOpen:Bytes->Void, ?onCancel:Void->Void, ?defaultPath:String, ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = convertTypeFilter(typeFilter);
+    var filter:String = convertTypeFilter(typeFilter);
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onOpen != null) fileDialog.onOpen.add(onOpen);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
     fileDialog.open(filter, defaultPath, dialogTitle);
     return true;
     #elseif html5
-    var onFileLoaded = function(event) {
+    var onFileLoaded:Event->Void = function(event) {
       var loadedFileRef:FileReference = event.target;
       trace('Loaded file: ' + loadedFileRef.name);
       onOpen(loadedFileRef.data);
     }
 
-    var onFileSelected = function(event) {
+    var onFileSelected:Event->Void = function(event) {
       var selectedFileRef:FileReference = event.target;
       trace('Selected file: ' + selectedFileRef.name);
       selectedFileRef.addEventListener(Event.COMPLETE, onFileLoaded);
       selectedFileRef.load();
     }
 
-    var fileRef = new FileReference();
+    var fileRef:FileReference = new FileReference();
     fileRef.addEventListener(Event.SELECT, onFileSelected);
     fileRef.browse(typeFilter);
     return true;
@@ -171,24 +171,24 @@ class FileUtil
   /**
    * Browses for a single file location, then writes the provided `haxe.io.Bytes` data and calls `onSave(path)` when done.
    * Works great on desktop and HTML5.
-   * 
+   *
    * @return Whether the file dialog was opened successfully.
    */
   public static function saveFile(data:Bytes, ?onSave:String->Void, ?onCancel:Void->Void, ?defaultFileName:String, ?dialogTitle:String):Bool
   {
     #if desktop
-    var filter = defaultFileName != null ? Path.extension(defaultFileName) : null;
+    var filter:String = defaultFileName != null ? Path.extension(defaultFileName) : null;
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSave != null) fileDialog.onSelect.add(onSave);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
     fileDialog.save(data, filter, defaultFileName, dialogTitle);
     return true;
     #elseif html5
-    var filter = defaultFileName != null ? Path.extension(defaultFileName) : null;
+    var filter:String = defaultFileName != null ? Path.extension(defaultFileName) : null;
 
-    var fileDialog = new FileDialog();
+    var fileDialog:FileDialog = new FileDialog();
     if (onSave != null) fileDialog.onSave.add(onSave);
     if (onCancel != null) fileDialog.onCancel.add(onCancel);
 
@@ -204,7 +204,7 @@ class FileUtil
    * Prompts the user to save multiple files.
    * On desktop, this will prompt the user for a directory, then write all of the files to there.
    * On HTML5, this will zip the files up and prompt the user to save that.
-   * 
+   *
    * @param typeFilter TODO What does this do?
    * @return Whether the file dialog was opened successfully.
    */
@@ -213,7 +213,7 @@ class FileUtil
   {
     #if desktop
     // Prompt the user for a directory, then write all of the files to there.
-    var onSelectDir = function(targetPath:String) {
+    var onSelectDir:String->Void = function(targetPath:String):Void {
       var paths:Array<String> = [];
       for (resource in resources)
       {
@@ -230,7 +230,7 @@ class FileUtil
             writeBytesToPath(filePath, resource.data, force ? Force : Skip);
           }
         }
-        catch (e:Dynamic)
+        catch (_)
         {
           trace('Failed to write file (probably already exists): $filePath' + filePath);
           continue;
@@ -240,7 +240,7 @@ class FileUtil
       onSaveAll(paths);
     }
 
-    browseForDirectory(null, onSelectDir, onCancel, defaultPath, "Choose directory to save all files to...");
+    browseForDirectory(null, onSelectDir, onCancel, defaultPath, 'Choose directory to save all files to...');
 
     return true;
     #elseif html5
@@ -260,14 +260,14 @@ class FileUtil
       ?force:Bool = false):Bool
   {
     // Create a ZIP file.
-    var zipBytes = createZIPFromEntries(resources);
+    var zipBytes:Bytes = createZIPFromEntries(resources);
 
-    var onSave = function(path:String) {
+    var onSave:String->Void = function(path:String) {
       onSave([path]);
     };
 
     // Prompt the user to save the ZIP file.
-    saveFile(zipBytes, onSave, onCancel, defaultPath, "Save files as ZIP...");
+    saveFile(zipBytes, onSave, onCancel, defaultPath, 'Save files as ZIP...');
 
     return true;
   }
@@ -282,7 +282,7 @@ class FileUtil
   {
     #if desktop
     // Create a ZIP file.
-    var zipBytes = createZIPFromEntries(resources);
+    var zipBytes:Bytes = createZIPFromEntries(resources);
 
     // Write the ZIP.
     writeBytesToPath(path, zipBytes, force ? Force : Skip);
@@ -293,13 +293,70 @@ class FileUtil
     #end
   }
 
+  /**
+   * Read string file contents directly from a given path.
+   * Only works on desktop.
+   *
+   * @param path The path to the file.
+   * @return The file contents.
+   */
+  public static function readStringFromPath(path:String):String
+  {
+    #if sys
+    return sys.io.File.getContent(path);
+    #else
+    return null;
+    #end
+  }
+
+  /**
+   * Read bytes file contents directly from a given path.
+   * Only works on desktop.
+   *
+   * @param path The path to the file.
+   * @return The file contents.
+   */
+  public static function readBytesFromPath(path:String):Bytes
+  {
+    #if sys
+    return Bytes.ofString(sys.io.File.getContent(path));
+    #else
+    return null;
+    #end
+  }
+
+  /**
+   * Read JSON file contents directly from a given path.
+   * Only works on desktop.
+   *
+   * @param path The path to the file.
+   * @return The JSON data.
+   */
+  public static function readJSONFromPath(path:String):Dynamic
+  {
+    #if sys
+    try
+    {
+      return SerializerUtil.fromJSON(sys.io.File.getContent(path));
+    }
+    catch (ex)
+    {
+      return null;
+    }
+    #else
+    return null;
+    #end
+  }
+
   /**
    * Write string file contents directly to a given path.
    * Only works on desktop.
-   * 
+   *
+   * @param path The path to the file.
+   * @param data The string to write.
    * @param mode Whether to Force, Skip, or Ask to overwrite an existing file.
    */
-  public static function writeStringToPath(path:String, data:String, mode:FileWriteMode = Skip)
+  public static function writeStringToPath(path:String, data:String, mode:FileWriteMode = Skip):Void
   {
     #if sys
     createDirIfNotExists(Path.directory(path));
@@ -335,10 +392,12 @@ class FileUtil
   /**
    * Write byte file contents directly to a given path.
    * Only works on desktop.
-   * 
+   *
+   * @param path The path to the file.
+   * @param data The bytes to write.
    * @param mode Whether to Force, Skip, or Ask to overwrite an existing file.
    */
-  public static function writeBytesToPath(path:String, data:Bytes, mode:FileWriteMode = Skip)
+  public static function writeBytesToPath(path:String, data:Bytes, mode:FileWriteMode = Skip):Void
   {
     #if sys
     createDirIfNotExists(Path.directory(path));
@@ -374,8 +433,11 @@ class FileUtil
   /**
    * Write string file contents directly to the end of a file at the given path.
    * Only works on desktop.
+   *
+   * @param path The path to the file.
+   * @param data The string to append.
    */
-  public static function appendStringToPath(path:String, data:String)
+  public static function appendStringToPath(path:String, data:String):Void
   {
     #if sys
     sys.io.File.append(path, false).writeString(data);
@@ -387,8 +449,10 @@ class FileUtil
   /**
    * Create a directory if it doesn't already exist.
    * Only works on desktop.
+   *
+   * @param dir The path to the directory.
    */
-  public static function createDirIfNotExists(dir:String)
+  public static function createDirIfNotExists(dir:String):Void
   {
     #if sys
     if (!sys.FileSystem.exists(dir))
@@ -404,6 +468,8 @@ class FileUtil
   /**
    * Get the path to a temporary directory we can use for writing files.
    * Only works on desktop.
+   *
+   * @return The path to the temporary directory.
    */
   public static function getTempDir():String
   {
@@ -421,9 +487,11 @@ class FileUtil
       if (path != null) break;
     }
 
-    return tempDir = Path.join([path, 'funkin/']);
+    tempDir = Path.join([path, 'funkin/']);
+    return tempDir;
     #else
-    return tempDir = '/tmp/funkin/';
+    tempDir = '/tmp/funkin/';
+    return tempDir;
     #end
     #else
     return null;
@@ -432,15 +500,15 @@ class FileUtil
 
   /**
    * Create a Bytes object containing a ZIP file, containing the provided entries.
-   * 
+   *
    * @param entries The entries to add to the ZIP file.
    * @return The ZIP file as a Bytes object.
    */
   public static function createZIPFromEntries(entries:Array<Entry>):Bytes
   {
-    var o = new haxe.io.BytesOutput();
+    var o:haxe.io.BytesOutput = new haxe.io.BytesOutput();
 
-    var zipWriter = new haxe.zip.Writer(o);
+    var zipWriter:haxe.zip.Writer = new haxe.zip.Writer(o);
     zipWriter.write(entries.list());
 
     return o.getBytes();
@@ -448,15 +516,27 @@ class FileUtil
 
   /**
    * Create a ZIP file entry from a file name and its string contents.
-   * 
+   *
    * @param name The name of the file. You can use slashes to create subdirectories.
    * @param content The string contents of the file.
    * @return The resulting entry.
    */
   public static function makeZIPEntry(name:String, content:String):Entry
   {
-    var data = haxe.io.Bytes.ofString(content, UTF8);
+    var data:Bytes = haxe.io.Bytes.ofString(content, UTF8);
 
+    return makeZIPEntryFromBytes(name, data);
+  }
+
+  /**
+   * Create a ZIP file entry from a file name and its string contents.
+   *
+   * @param name The name of the file. You can use slashes to create subdirectories.
+   * @param data The byte data of the file.
+   * @return The resulting entry.
+   */
+  public static function makeZIPEntryFromBytes(name:String, data:haxe.io.Bytes):Entry
+  {
     return {
       fileName: name,
       fileSize: data.length,
@@ -474,15 +554,15 @@ class FileUtil
 
   static function convertTypeFilter(typeFilter:Array<FileFilter>):String
   {
-    var filter = null;
+    var filter:String = null;
     if (typeFilter != null)
     {
-      var filters = [];
+      var filters:Array<String> = [];
       for (type in typeFilter)
       {
-        filters.push(StringTools.replace(StringTools.replace(type.extension, "*.", ""), ";", ","));
+        filters.push(StringTools.replace(StringTools.replace(type.extension, '*.', ''), ';', ','));
       }
-      filter = filters.join(";");
+      filter = filters.join(';');
     }
 
     return filter;