diff --git a/games/game_sims4.py b/games/game_sims4.py
index a3c905b2..ca342768 100644
--- a/games/game_sims4.py
+++ b/games/game_sims4.py
@@ -1,12 +1,35 @@
-import mobase
+from collections.abc import Callable
+from enum import IntEnum
+from re import match
+from typing import Any, List, Set, cast
+
+from mobase import (
+    FileTreeEntry,
+    IFileTree,
+    IOrganizer,
+    ModDataChecker,
+    ModDataContent,
+    ReleaseType,
+    VersionInfo,
+)
 
 from ..basic_game import BasicGame
 
 
+class Content(IntEnum):
+    PACKAGE = 0
+    SCRIPT = 1
+
+
+class ValidationResult(IntEnum):
+    INVALID = 0
+    VALID = 1
+    FIXABLE = 2
+
+
 class TS4Game(BasicGame):
     Name = "The Sims 4 Support Plugin"
-    Author = "R3z Shark"
-
+    Author = "R3z Shark, xieve"
     GameName = "The Sims 4"
     GameShortName = "thesims4"
     GameBinary = "Game/Bin/TS4_x64.exe"
@@ -16,5 +39,113 @@ class TS4Game(BasicGame):
     GameOriginWatcherExecutables = ("TS4_x64.exe",)
 
     def version(self):
-        # Don't forget to import mobase!
-        return mobase.VersionInfo(1, 0, 0, mobase.ReleaseType.FINAL)
+        return VersionInfo(1, 0, 0, ReleaseType.FINAL)
+
+    def documentsDirectory(self):
+        return self.dataDirectory()
+
+    def init(self, organizer: IOrganizer):
+        if super().init(organizer):
+            self._register_feature(TS4ModDataChecker())
+            self._register_feature(TS4ModDataContent())
+            return True
+        return False
+
+
+class TS4ModDataChecker(ModDataChecker):
+    # .package files are allowed at a maximum depth of 5 subfolders, script files can be at most one level deep
+    # The first capturing group lazily captures any parent folders exceeding that depth, see below
+    _fixableOrValid = r"(?i)^(.*?)((?:[^\\]+\\){0,5}[^\\]*\.package|(?:[^\\]+\\)?[^\\]*\.ts4script|(?:[^\\]+\\)scripts\\.*\.py)$"
+
+    def dataLooksValid(self, filetree: IFileTree) -> ModDataChecker.CheckReturn:
+        return cast(
+            ModDataChecker.CheckReturn,
+            self._fixOrValidateTree(filetree, validateMode=True),
+        )
+
+    def fix(self, filetree: IFileTree) -> IFileTree | None:
+        return cast(IFileTree, self._fixOrValidateTree(filetree))
+
+    def _fixOrValidateTree(
+        self,
+        tree: IFileTree,
+        validateMode: bool = False,
+    ) -> IFileTree | ModDataChecker.CheckReturn:
+        validationResult = ValidationResult.INVALID
+        checkReturn = ModDataChecker.INVALID
+        walkReturn = IFileTree.CONTINUE
+
+        def setValidationResult(
+            newResult: ValidationResult = ValidationResult.INVALID,
+            actionCallback: Callable[[], Any] = lambda: None,
+        ):
+            nonlocal validationResult
+            nonlocal checkReturn
+            nonlocal walkReturn
+            if validateMode:
+                validationResult = max(validationResult, newResult)
+                match validationResult:
+                    case ValidationResult.INVALID:
+                        pass
+                    case ValidationResult.VALID:
+                        checkReturn = ModDataChecker.VALID
+                    case ValidationResult.FIXABLE:
+                        checkReturn = ModDataChecker.FIXABLE
+                        walkReturn = IFileTree.STOP
+            else:
+                actionCallback()
+
+        def fixOrValidateEntry(
+            parentPath: str, entry: FileTreeEntry
+        ) -> IFileTree.WalkReturn:
+            path = f"{parentPath}{entry.name()}"
+            fixableOrValid = match(self._fixableOrValid, path)
+            if fixableOrValid:
+                match fixableOrValid.groups():
+                    case ["", _]:
+                        setValidationResult(ValidationResult.VALID)
+                    case [_, innerPath]:
+                        # Move files that are nested too deeply up, preserving the inner folder structure
+                        # E.g. a/b/c.ts4script will be moved to b/c.ts4script
+                        setValidationResult(
+                            ValidationResult.FIXABLE,
+                            lambda: tree.move(entry, innerPath),
+                        )
+            return walkReturn
+
+        tree.walk(fixOrValidateEntry)
+
+        if validateMode:
+            return checkReturn
+        else:
+            return tree
+
+
+class TS4ModDataContent(ModDataContent):
+    def getAllContents(self: ModDataContent) -> List[ModDataContent.Content]:
+        return [
+            ModDataContent.Content(
+                Content.PACKAGE, "Package", ":/MO/gui/content/plugin"
+            ),
+            ModDataContent.Content(Content.SCRIPT, "Script", ":/MO/gui/content/script"),
+        ]
+
+    def getContentsFor(self: ModDataContent, filetree: IFileTree) -> List[int]:
+        contents: Set[int] = set()
+
+        def getContentForEntry(path: str, entry: FileTreeEntry):
+            nonlocal contents
+            match entry.suffix():
+                case "package":
+                    contents.add(Content.PACKAGE)
+                case "ts4script" | "py":
+                    contents.add(Content.SCRIPT)
+                case _:
+                    pass
+            if len(contents) == 2:
+                return IFileTree.STOP
+            else:
+                return IFileTree.CONTINUE
+
+        filetree.walk(getContentForEntry)
+        return list(contents)