diff --git a/View.aspx.cs b/View.aspx.cs
new file mode 100644
index 0000000..8caa644
--- /dev/null
+++ b/View.aspx.cs
@@ -0,0 +1,471 @@
+using System;
+using System.IO;
+using System.Security;
+using System.Web;
+using System.Web.UI;
+
+namespace FileSharePortal
+{
+    public partial class View : Page
+    {
+        private const string ShareRoot =
+            @"\\LAN-DC1\Fileshare";
+
+
+        protected void Page_Load(
+            object sender,
+            EventArgs e)
+        {
+            Response.Cache.SetCacheability(
+                HttpCacheability.NoCache);
+
+            Response.Cache.SetNoStore();
+
+
+            string relativePath =
+                Request.QueryString["path"];
+
+
+            if (string.IsNullOrWhiteSpace(relativePath))
+            {
+                Response.StatusCode = 400;
+                CompleteResponse();
+                return;
+            }
+
+
+            string physicalPath;
+
+
+            try
+            {
+                physicalPath =
+                    GetSafePhysicalFilePath(
+                        relativePath);
+            }
+            catch (UnauthorizedAccessException)
+            {
+                Response.StatusCode = 403;
+                CompleteResponse();
+                return;
+            }
+            catch (SecurityException)
+            {
+                Response.StatusCode = 403;
+                CompleteResponse();
+                return;
+            }
+            catch (FileNotFoundException)
+            {
+                Response.StatusCode = 404;
+                CompleteResponse();
+                return;
+            }
+            catch (DirectoryNotFoundException)
+            {
+                Response.StatusCode = 404;
+                CompleteResponse();
+                return;
+            }
+            catch
+            {
+                Response.StatusCode = 400;
+                CompleteResponse();
+                return;
+            }
+
+
+            if (!File.Exists(physicalPath))
+            {
+                Response.StatusCode = 404;
+                CompleteResponse();
+                return;
+            }
+
+
+            /*
+             * ====================================================
+             * BERECHTIGUNG PRÜFEN
+             * ====================================================
+             *
+             * Durch ASP.NET Impersonation läuft der Zugriff
+             * unter dem angemeldeten AD-Benutzer.
+             */
+            try
+            {
+                using (
+                    FileStream stream =
+                        new FileStream(
+                            physicalPath,
+                            FileMode.Open,
+                            FileAccess.Read,
+                            FileShare.ReadWrite |
+                            FileShare.Delete))
+                {
+                }
+            }
+            catch (UnauthorizedAccessException)
+            {
+                Response.StatusCode = 403;
+                CompleteResponse();
+                return;
+            }
+            catch (IOException)
+            {
+                Response.StatusCode = 403;
+                CompleteResponse();
+                return;
+            }
+
+
+            string extension =
+                Path.GetExtension(
+                    physicalPath)
+                .ToLowerInvariant();
+
+
+            string fileName =
+                Path.GetFileName(
+                    physicalPath);
+
+
+            /*
+             * ====================================================
+             * MIME-TYP
+             * ====================================================
+             */
+
+            string contentType =
+                GetContentType(
+                    extension);
+
+
+            /*
+             * ====================================================
+             * INLINE ODER DOWNLOAD
+             * ====================================================
+             *
+             * Nur ausdrücklich erlaubte Dateitypen werden
+             * inline angezeigt.
+             *
+             * Alles andere wird als Download behandelt.
+             */
+            bool inline =
+                IsInlineType(extension);
+
+
+            Response.Clear();
+
+            Response.Buffer = false;
+
+            Response.ContentType =
+                contentType;
+
+
+            /*
+             * UTF-8-Dateiname.
+             */
+            string encodedFileName =
+                Uri.EscapeDataString(
+                    fileName);
+
+
+            if (inline)
+            {
+                Response.AddHeader(
+                    "Content-Disposition",
+                    "inline; filename*=UTF-8''" +
+                    encodedFileName);
+            }
+            else
+            {
+                Response.AddHeader(
+                    "Content-Disposition",
+                    "attachment; filename*=UTF-8''" +
+                    encodedFileName);
+            }
+
+
+            FileInfo fileInfo =
+                new FileInfo(
+                    physicalPath);
+
+
+            Response.AddHeader(
+                "Content-Length",
+                fileInfo.Length.ToString());
+
+
+            /*
+             * Datei ohne komplettes Einlesen in den
+             * Arbeitsspeicher übertragen.
+             */
+            Response.TransmitFile(
+                physicalPath);
+
+
+            CompleteResponse();
+        }
+
+
+        /*
+         * ========================================================
+         * INLINE DATEITYPEN
+         * ========================================================
+         */
+
+        private bool IsInlineType(
+            string extension)
+        {
+            switch (extension)
+            {
+                /*
+                 * PDF
+                 */
+                case ".pdf":
+
+                /*
+                 * Bilder
+                 */
+                case ".jpg":
+                case ".jpeg":
+                case ".png":
+                case ".gif":
+                case ".webp":
+                case ".bmp":
+                case ".ico":
+
+                /*
+                 * Text
+                 */
+                case ".txt":
+                case ".log":
+                case ".csv":
+                case ".json":
+                case ".xml":
+
+                /*
+                 * Audio
+                 */
+                case ".mp3":
+                case ".wav":
+                case ".ogg":
+
+                /*
+                 * Video
+                 */
+                case ".mp4":
+                case ".webm":
+                case ".ogv":
+
+                    return true;
+
+
+                /*
+                 * Alles andere herunterladen.
+                 *
+                 * Insbesondere:
+                 *
+                 * DOC
+                 * DOCX
+                 * XLS
+                 * XLSX
+                 * PPT
+                 * PPTX
+                 * ZIP
+                 * EXE
+                 * MSI
+                 *
+                 * usw.
+                 */
+                default:
+
+                    return false;
+            }
+        }
+
+
+        /*
+         * ========================================================
+         * MIME TYPES
+         * ========================================================
+         */
+
+        private string GetContentType(
+            string extension)
+        {
+            switch (extension)
+            {
+                case ".pdf":
+                    return "application/pdf";
+
+
+                case ".jpg":
+                case ".jpeg":
+                    return "image/jpeg";
+
+
+                case ".png":
+                    return "image/png";
+
+
+                case ".gif":
+                    return "image/gif";
+
+
+                case ".webp":
+                    return "image/webp";
+
+
+                case ".bmp":
+                    return "image/bmp";
+
+
+                case ".ico":
+                    return "image/x-icon";
+
+
+                /*
+                 * Text-Dateien bewusst als text/plain
+                 * behandeln.
+                 *
+                 * Dadurch werden z.B. HTML-Inhalte nicht
+                 * als HTML ausgeführt.
+                 */
+                case ".txt":
+                case ".log":
+                case ".csv":
+                case ".json":
+                case ".xml":
+                    return "text/plain; charset=utf-8";
+
+
+                case ".mp3":
+                    return "audio/mpeg";
+
+
+                case ".wav":
+                    return "audio/wav";
+
+
+                case ".ogg":
+                    return "audio/ogg";
+
+
+                case ".mp4":
+                    return "video/mp4";
+
+
+                case ".webm":
+                    return "video/webm";
+
+
+                case ".ogv":
+                    return "video/ogg";
+
+
+                default:
+                    return MimeMapping.GetMimeMapping(
+                        "file" + extension);
+            }
+        }
+
+
+        /*
+         * ========================================================
+         * SICHEREN DATEIPFAD ERMITTELN
+         * ========================================================
+         */
+
+        private string GetSafePhysicalFilePath(
+            string relativePath)
+        {
+            string decoded =
+                HttpUtility.UrlDecode(
+                    relativePath);
+
+
+            decoded =
+                decoded.Replace(
+                    '/',
+                    '\\');
+
+
+            /*
+             * Keine absoluten Pfade.
+             */
+            if (
+                decoded.StartsWith("\\") ||
+                decoded.Contains(":"))
+            {
+                throw new SecurityException();
+            }
+
+
+            /*
+             * Path Traversal verhindern.
+             */
+            string[] parts =
+                decoded.Split(
+                    new[] { '\\' },
+                    StringSplitOptions.RemoveEmptyEntries);
+
+
+            foreach (
+                string part
+                in parts)
+            {
+                if (
+                    part == "." ||
+                    part == "..")
+                {
+                    throw new SecurityException();
+                }
+            }
+
+
+            string fullPath =
+                Path.GetFullPath(
+                    Path.Combine(
+                        ShareRoot,
+                        decoded));
+
+
+            string normalizedRoot =
+                Path.GetFullPath(
+                    ShareRoot)
+                .TrimEnd('\\') +
+                "\\";
+
+
+            /*
+             * Der Pfad darf ausschließlich unterhalb
+             * unseres Shares liegen.
+             */
+            if (
+                !fullPath.StartsWith(
+                    normalizedRoot,
+                    StringComparison.OrdinalIgnoreCase))
+            {
+                throw new SecurityException();
+            }
+
+
+            if (!File.Exists(fullPath))
+            {
+                throw new FileNotFoundException();
+            }
+
+
+            return fullPath;
+        }
+
+
+        private void CompleteResponse()
+        {
+            HttpContext.Current
+                .ApplicationInstance
+                .CompleteRequest();
+        }
+    }
+}
\ No newline at end of file
diff --git a/view.aspx b/view.aspx
new file mode 100644
index 0000000..74f2c48
--- /dev/null
+++ b/view.aspx
@@ -0,0 +1,8 @@
+<%@ Page
+    Language="C#"
+    ResponseEncoding="utf-8"
+    ContentType="text/html; charset=utf-8"
+    AutoEventWireup="true"
+    CodeFile="View.aspx.cs"
+    Inherits="FileSharePortal.View"
+%>
\ No newline at end of file
diff --git a/web.config b/web.config
new file mode 100644
index 0000000..e4a23cd
--- /dev/null
+++ b/web.config
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<configuration>
+
+  <system.web>
+
+    <!-- ASP.NET Framework-Version -->
+    <compilation debug="false" targetFramework="4.8" />
+
+    <httpRuntime targetFramework="4.8" />
+
+    <!--
+      IIS authentifiziert den Benutzer per Basic Authentication.
+
+      ASP.NET verwendet die Windows-Identität für die Anwendung.
+    -->
+    <authentication mode="Windows" />
+
+    <!--
+      ASP.NET läuft unter dem authentifizierten Benutzer.
+      Dadurch greifen die NTFS-/Share-Berechtigungen dieses Benutzers
+      auch beim Zugriff auf \\LAN-DC1\Fileshare.
+    -->
+    <identity impersonate="true" />
+
+    <!--
+      Nicht authentifizierte Benutzer dürfen das Portal nicht aufrufen.
+    -->
+    <authorization>
+      <deny users="?" />
+    </authorization>
+
+    <!--
+      Zeichencodierung.
+      requestEncoding, responseEncoding und fileEncoding
+      gehören in den globalization-Abschnitt.
+    -->
+    <globalization requestEncoding="utf-8" responseEncoding="utf-8" fileEncoding="utf-8" culture="de-DE" uiCulture="de-DE" />
+
+  </system.web>
+
+
+  <system.webServer>
+
+    <!--
+      Default.aspx ist die Startseite des ASP.NET-Portals.
+    -->
+    <defaultDocument enabled="true">
+
+      <files>
+
+        <clear />
+
+        <add value="Default.aspx" />
+
+      </files>
+
+    </defaultDocument>
+
+
+    <!--
+      Das Portal verwendet seine eigene Dateiansicht.
+      IIS Directory Browsing soll hier nicht verwendet werden.
+    -->
+    <directoryBrowse enabled="false" />
+
+  </system.webServer>
+
+</configuration>
\ No newline at end of file