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    <p>I tried to create a small C# app to modify the embedded manifest so it wouldn't request admin privileges. This is the solution I finally came up with, making a bunch of Win32 calls to extract the manifest and replace an existing manifest. It's already long enough, so I omitted the part where I actually modify the manifest (just some basic XML operations).</p> <p>There are two static methods here: <strong>LoadManifestResource</strong>, which loads the string representation of the embedded manifest of an executable and <strong>SaveManifestResource</strong>, which saves the string representation of a manifest resource in the specified executable, overwriting the old one.</p> <p>This is a quick and dirty solution which worked just fine for me, but might very well not work in every case.</p> <pre><code>public static class Library { [DllImport("kernel32.dll")] static extern IntPtr LoadLibraryEx(string lpFileName, IntPtr hReservedNull, LoadLibraryFlags dwFlags); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] static extern bool FreeLibrary(IntPtr hModule); [DllImport("kernel32.dll")] static extern IntPtr FindResource(IntPtr hModule, int lpName, int lpType); [DllImport("kernel32.dll", SetLastError = true)] static extern IntPtr LoadResource(IntPtr hModule, IntPtr hResInfo); [DllImport("kernel32.dll")] static extern IntPtr LockResource(IntPtr hResData); [DllImport("Kernel32.dll", EntryPoint = "SizeofResource", SetLastError = true)] private static extern uint SizeofResource(IntPtr hModule, IntPtr hResource); [System.Flags] enum LoadLibraryFlags : uint { DONT_RESOLVE_DLL_REFERENCES = 0x00000001, LOAD_IGNORE_CODE_AUTHZ_LEVEL = 0x00000010, LOAD_LIBRARY_AS_DATAFILE = 0x00000002, LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE = 0x00000040, LOAD_LIBRARY_AS_IMAGE_RESOURCE = 0x00000020, LOAD_WITH_ALTERED_SEARCH_PATH = 0x00000008 } public static unsafe string LoadManifestResource(string fileName) { // load library to retrieve manifest from var libraryHandle = LoadLibraryEx(fileName, IntPtr.Zero, LoadLibraryFlags.LOAD_LIBRARY_AS_DATAFILE); if (libraryHandle.ToInt32() == 0) { throw new Win32Exception(Marshal.GetLastWin32Error(), "couldn't load library"); } try { // find manifest var resource = FindResource(libraryHandle, 1, 24); if (resource.ToInt32() == 0) { throw new Win32Exception(Marshal.GetLastWin32Error(), "couldn't find manifest resource"); } // load manifest var loadedManifest = LoadResource(libraryHandle, resource); if (loadedManifest.ToInt32() == 0) { throw new Win32Exception(Marshal.GetLastWin32Error(), "couldn't load manifest resource"); } // lock manifest var lockedManifest = LockResource(loadedManifest); if (lockedManifest.ToInt32() == 0) { throw new Win32Exception(Marshal.GetLastWin32Error(), "couldn't lock manifest resource"); } // calculate size of manifest, copy to byte array and convert to string int manifestSize = (int)SizeofResource(libraryHandle, resource); byte[] data = new byte[manifestSize]; Marshal.Copy(lockedManifest, data, 0, manifestSize); var manifest = Encoding.UTF8.GetString(data); return manifest; } finally { FreeLibrary(libraryHandle); } } [DllImport("kernel32.dll", SetLastError = true)] static extern IntPtr BeginUpdateResource(string pFileName, [MarshalAs(UnmanagedType.Bool)]bool bDeleteExistingResources); [DllImport("kernel32.dll", SetLastError = true)] static extern bool UpdateResource(IntPtr hUpdate, string lpType, string lpName, ushort wLanguage, IntPtr lpData, uint cbData); [DllImport("kernel32.dll", SetLastError = true)] static extern bool UpdateResource(IntPtr hUpdate, int lpType, int lpName, ushort wLanguage, IntPtr lpData, uint cbData); [DllImport("kernel32.dll", SetLastError = true)] static extern bool EndUpdateResource(IntPtr hUpdate, bool fDiscard); public static unsafe void SaveManifestResource(string file, string manifest) { var hUpdate = BeginUpdateResource(file, false); byte[] bytes = Encoding.UTF8.GetBytes(manifest); IntPtr ptr = Marshal.AllocHGlobal(bytes.Length); try { Marshal.Copy(bytes, 0, ptr, bytes.Length); if (!UpdateResource(hUpdate, 24, 1, 0, ptr, (uint)bytes.Length)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } if (!EndUpdateResource(hUpdate, false)) { throw new Win32Exception(Marshal.GetLastWin32Error()); } } finally { Marshal.FreeHGlobal(ptr); } } } </code></pre>
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