Windows support

Core.py

@@ -5,8 +5,10 @@ SaraView/Backend/DefaultThemes/CatppuccinMocha.toml and Frontend/src/Styles/Them
 one accent colour (Purple/Mauve) used everywhere, not a mauve+lavender mix.
 """
 
+import os
 import shutil
 import subprocess
+import sys
 from dataclasses import asdict, dataclass, field
 from pathlib import Path
 from typing import Callable, Optional
@@ -45,7 +47,19 @@ AppName = "SaraFem"
 BundledFontFamily = "Fixedsys Excelsior"
 ActiveFontFamily = BundledFontFamily  # set by ApplyAppearance, read by BuildTheme
 
-CacheDir = Path.home() / ".cache" / "SaraFem"
+IsWindows = sys.platform == "win32"
+
+# Each system's own per-user folders, like SaraSuite's: ~/.config and ~/.cache
+# on Linux; %APPDATA% (settings) and %LOCALAPPDATA% (caches) on Windows.
+if IsWindows:
+    ConfigHome = Path(os.environ.get("APPDATA") or Path.home() / "AppData" / "Roaming")
+    CacheDir = Path(os.environ.get("LOCALAPPDATA") or Path.home() / "AppData" / "Local") / "SaraFem" / "Cache"
+    # Where the file tree starts by default: the system drive (C:\), not "/".
+    DefaultFiletreeRoot = (os.environ.get("SystemDrive") or "C:") + "\\"
+else:
+    ConfigHome = Path(os.environ.get("XDG_CONFIG_HOME") or Path.home() / ".config")
+    CacheDir = Path(os.environ.get("XDG_CACHE_HOME") or Path.home() / ".cache") / "SaraFem"
+    DefaultFiletreeRoot = "/"
 ThumbnailCacheDir = CacheDir / "Thumbnails"
 
 # Copy/Cut/Paste uses the real OS clipboard (Clipboard.set_files/get_files —
@@ -72,7 +86,7 @@ def GetClipboardMode() -> str:
 
 # Config moved from ~/.config/SaraFem/ into a SaraSuite-wide layout so other
 # Sara* programs (SaraTag, SaraView) can eventually read from the same place.
-SharedConfigDir = Path.home() / ".config" / "SaraSuite"
+SharedConfigDir = ConfigHome / "SaraSuite"
 ThemesDir = SharedConfigDir / "Themes"
 ConfigDir = SharedConfigDir / "SaraFem"
 ConfigPath = ConfigDir / "Config.toml"
@@ -328,7 +342,7 @@ class AppConfig:
     # always showing it with a "No devices." placeholder.
     AutoHideEmptyDevices: bool = False
     ShowFiletree: bool = True
-    FiletreeRoot: str = "/"
+    FiletreeRoot: str = DefaultFiletreeRoot
     BookmarksMinHeight: int = 0  # 0 = no constraint
     BookmarksMaxHeight: int = 0
     DevicesMinHeight: int = 0
@@ -552,9 +566,41 @@ def ApplyAppearance(Settings: SharedSettings) -> None:
     ActiveFontFamily = Settings.FontFamily or BundledFontFamily
 
 
+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 InstalledFontFamilies() -> list[str]:
-    """Font families fontconfig knows about, for the font picker. The
-    bundled font is always first, since it isn't installed system-wide."""
+    """Font families fontconfig (or, on Windows, the registry) knows about,
+    for the font picker. The bundled font is always first, since it isn't
+    installed system-wide."""
+    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)
         Families = {Line.split(",")[0].strip() for Line in Result.stdout.splitlines() if Line.strip()}