diff --git a/Endpoints/WorkspaceEndpoint.cs b/Endpoints/WorkspaceEndpoint.cs
index 86e6cae..58851d5 100644
--- a/Endpoints/WorkspaceEndpoint.cs
+++ b/Endpoints/WorkspaceEndpoint.cs
@@ -304,7 +304,7 @@ public static class WorkspaceEndpoint
         {
             var drives = System.IO.DriveInfo.GetDrives()
                 .Where(d => d.IsReady)
-                .Select(d => new { name = d.Name.TrimEnd('\\'), path = d.Name.Replace('\\', '/'), type = "dir" })
+                .Select(d => new { name = d.Name.TrimEnd('\\'), path = d.Name.TrimEnd('\\'), type = "dir" })
                 .ToList<object>();
             await ctx.Response.WriteAsJsonAsync(new { current = "", entries = drives });
             return;
@@ -326,12 +326,12 @@ public static class WorkspaceEndpoint
             {
                 var name = Path.GetFileName(dir);
                 if (IgnoredDirs.Contains(name)) continue;
-                entries.Add(new { name, path = dir.Replace('\\', '/'), type = "dir" });
+                entries.Add(new { name, path = dir, type = "dir" });
             }
         }
         catch (UnauthorizedAccessException) { }
 
-        await ctx.Response.WriteAsJsonAsync(new { current = targetPath.Replace('\\', '/'), entries });
+        await ctx.Response.WriteAsJsonAsync(new { current = targetPath, entries });
     }
 
     private static async Task HandleBrowseMkdir(HttpContext ctx)
@@ -362,7 +362,7 @@ public static class WorkspaceEndpoint
         }
 
         Directory.CreateDirectory(targetPath);
-        await ctx.Response.WriteAsJsonAsync(new { path = targetPath.Replace('\\', '/'), created = true });
+        await ctx.Response.WriteAsJsonAsync(new { path = targetPath, created = true });
     }
 
     private static async Task HandleRawFile(HttpContext ctx)
diff --git a/wwwroot/js/file-explorer.js b/wwwroot/js/file-explorer.js
index 1518d20..e966673 100644
--- a/wwwroot/js/file-explorer.js
+++ b/wwwroot/js/file-explorer.js
@@ -579,10 +579,11 @@ async function fbLoadDir(absPath) {
       sidebar.innerHTML = '<div class="fe-empty">Leer</div>';
     }
 
-    const currentNorm = data.current.replace(/\/+$/, '');
+    const currentNorm = data.current.replace(/[\\/]+$/, '');
     const atBase = _feState.basePath && currentNorm === _feState.basePath;
-    const atRoot = currentNorm === '' || currentNorm === '/' || (serverIsWindows && /^[A-Z]:$/i.test(currentNorm));
-    document.getElementById('feBack').disabled = atBase || (atRoot && _feState.history.length === 0);
+    const atDriveList = serverIsWindows && currentNorm === '';
+    const atRoot = currentNorm === '' || currentNorm === '/';
+    document.getElementById('feBack').disabled = atBase || (atRoot && _feState.history.length === 0) || atDriveList;
   } catch (e) {
     sidebar.innerHTML = '<div class="fe-error">Netzwerk-Fehler</div>';
   }
@@ -591,13 +592,13 @@ async function fbLoadDir(absPath) {
 function fbGoBack() {
   if (!_feState) return;
   // Nicht über den basePath hinaus navigieren
-  const currentNorm = _feState.currentAbsPath.replace(/\/+$/, '');
+  const currentNorm = _feState.currentAbsPath.replace(/[\\/]+$/, '');
   if (_feState.basePath && currentNorm === _feState.basePath) return;
 
   if (_feState.history.length > 0) {
     const prev = _feState.history.pop();
     // Prüfe ob der vorherige Pfad über dem basePath liegt
-    if (_feState.basePath && !prev.replace(/\/+$/, '').startsWith(_feState.basePath)) {
+    if (_feState.basePath && !prev.replace(/[\\/]+$/, '').startsWith(_feState.basePath)) {
       _feState.history.length = 0;
       fbLoadDir(_feState.basePath);
       return;
@@ -608,10 +609,11 @@ function fbGoBack() {
     let parent;
     if (serverIsWindows && /^[A-Z]:$/i.test(currentNorm)) {
       parent = ''; // Laufwerk → zurück zur Laufwerksauswahl
-    } else if (serverIsWindows && /^[A-Z]:\/[^/]*$/i.test(currentNorm)) {
-      parent = currentNorm.substring(0, 2); // z.B. C:/Users → C:
+    } else if (serverIsWindows && /^[A-Z]:[\\\/][^\\\/]*$/i.test(currentNorm)) {
+      parent = currentNorm.substring(0, 2); // z.B. C:\Users → C:
     } else {
-      parent = currentNorm.includes('/') ? currentNorm.substring(0, currentNorm.lastIndexOf('/')) || (serverIsWindows ? '' : '/') : (serverIsWindows ? '' : '/');
+      const lastSep = Math.max(currentNorm.lastIndexOf('/'), currentNorm.lastIndexOf('\\'));
+      parent = lastSep > 0 ? currentNorm.substring(0, lastSep) : (serverIsWindows ? '' : '/');
     }
     if (parent !== currentNorm) {
       fbLoadDir(parent);