Windows support

Settings.py

@@ -12,7 +12,7 @@ import tomlkit
 
 from Core import (
     AppConfig, AvailableThemes, BundledFontFamily, ChildEnvironment, ChipButtonStyle, ExportSettings, Home,
-    ImportSettings, LoadSharedSettings, Palette, SharedSettings,
+    ImportSettings, IsWindows, LoadSharedSettings, Palette, SharedSettings,
 )
 from Library import ConfPath, ConfValue, DataDir, DataError, SaveConfValues
 from Widgets import App
@@ -28,8 +28,40 @@ def _Note(Text: str) -> ft.Text:
     return ft.Text(Text, color=Palette.Overlay0, size=12)
 
 
+def _WindowsFonts() -> set[str]:
+    """Font families from the system and per-user Fonts registry keys
+    ("Arial Bold (TrueType)" -> "Arial")."""
+    import re
+    import winreg
+
+    Families: set[str] = set()
+    Key = r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts"
+    for Root in (winreg.HKEY_LOCAL_MACHINE, winreg.HKEY_CURRENT_USER):
+        try:
+            with winreg.OpenKey(Root, Key) as Fonts:
+                Index = 0
+                while True:
+                    try:
+                        Name = winreg.EnumValue(Fonts, Index)[0]
+                    except OSError:
+                        break
+                    Index += 1
+                    Name = re.sub(r"\s*\(.*\)$", "", Name)
+                    Name = re.sub(r"\s+(Bold|Italic|Light|Semibold|SemiBold|Black|Regular|Medium|Thin)\b.*$", "", Name)
+                    if Name and "&" not in Name:
+                        Families.add(Name.strip())
+        except OSError:
+            continue
+    return Families
+
+
 def _Fonts() -> list[str]:
-    """Installed font families (fontconfig), with the bundled font first."""
+    """Installed font families (fontconfig, or the registry on Windows), with
+    the bundled font first."""
+    if IsWindows:
+        Families = _WindowsFonts()
+        Families.discard(BundledFontFamily)
+        return [BundledFontFamily] + sorted(Families, key=str.lower)
     try:
         Result = subprocess.run(
             ["fc-list", ":", "family"], capture_output=True, text=True, timeout=5, env=ChildEnvironment(),