diff --git a/dzgui/api/acf.py b/dzgui/api/acf.py
new file mode 100644
index 0000000..685cd2e
--- /dev/null
+++ b/dzgui/api/acf.py
@@ -0,0 +1,94 @@
+import re
+from collections.abc import Iterator
+from typing import Any
+
+
+class WorkshopACF:
+    def __init__(self, file: str) -> None:
+        super().__init__()
+
+        self.dict: dict[str, Any]
+        self.load(file)
+
+    def as_dict(self) -> dict[str, Any]:
+        return self.dict
+
+    def load(self, file: str) -> None:
+        delimiter = r"\t\t"
+        lines = []
+        with open(file, "r", encoding="utf-8") as f:
+            for line in f:
+                line = line.strip()
+                if not line:
+                    continue
+                els = re.split(delimiter, line, maxsplit=1)
+                lines.append(els)
+        self.dict = self.parse(iter(lines))
+
+    def parse(self, lines: Iterator[list[str]]) -> dict[str, str]:
+        acf: dict[str, Any] = {}
+        try:
+            while True:
+                line = next(lines)
+                if len(line) == 1:
+                    key = line[0]
+                    if key == "{":
+                        continue
+                        return acf
+                    elif key == "}":
+                        return acf
+                    else:
+                        key = self.dequote(key)
+                        acf[key] = self.parse(lines)
+                elif len(line) == 2:
+                    k, v = line
+                    k = self.dequote(k)
+                    v = self.dequote(v)
+                    try:
+                        n = list(acf.keys())[-1]
+                        acf[n][k] = v
+                    except Exception:
+                        acf[k] = v
+        except StopIteration:
+            return acf
+
+    def unpack(self, d: dict, lines: list[Any] = []) -> str:
+        t1 = "AppWorkshop"
+        t2 = ("WorkshopItemsInstalled", "WorkshopItemDetails")
+        for k, v in d.items():
+            if type(v) is dict:
+                if k in t1:
+                    self.indent = 0
+                elif k in t2:
+                    self.indent = 1
+                else:
+                    self.indent = 2
+                pref = "\t" * self.indent
+                lines.append(pref + self.enquote(k))
+                lines.append(pref + "{")
+                self.unpack(v, lines)
+                lines.append(pref + "}")
+            else:
+                pref = "\t" * (self.indent + 1)
+                lines.append(pref + self.enquote(k) + "\t\t" + self.enquote(v))
+        s = ""
+        for line in lines:
+            s += line + "\n"
+        return s
+
+    def to_file(self, file: str) -> None:
+        s = self.unpack(self.dict)
+        with open(file, "w") as f:
+            f.write(s)
+
+    @classmethod
+    def enquote(cls, s: str) -> str:
+        return f'"{s}"'
+
+    @classmethod
+    def dequote(cls, s: str) -> str:
+        return s.rstrip('"').lstrip('"')
+
+    def delete(self, modid: int) -> None:
+        del self.dict["AppWorkshop"]["WorkshopItemsInstalled"][modid]
+        del self.dict["AppWorkshop"]["WorkshopItemDetails"][modid]