diff --git a/UnitTests/CSharpRunner/TempFile.cs b/UnitTests/CSharpRunner/TempFile.cs
index fd93c0a7..a5241fc5 100644
--- a/UnitTests/CSharpRunner/TempFile.cs
+++ b/UnitTests/CSharpRunner/TempFile.cs
@@ -4,27 +4,60 @@ using static Vanara.PInvoke.Kernel32;
 
 namespace Vanara.PInvoke.Tests
 {
+	/// <summary>Creates a unique temporary file in the %APPDATA%\Temp folder and deletes it when disposed.</summary>
+	/// <seealso cref="System.IDisposable"/>
 	public class TempFile : IDisposable
 	{
+		/// <summary>The default value inserted into the file if not overridden by constructor parameter.</summary>
 		public const string tmpstr = @"Temporary";
 
-		public TempFile(Kernel32.FileAccess dwDesiredAccess, FileShare dwShareMode, FileMode dwCreationDisposition = FileMode.OpenOrCreate, FileFlagsAndAttributes dwFlagsAndAttributes = FileFlagsAndAttributes.FILE_ATTRIBUTE_NORMAL) : this()
-		{
+		/// <summary>Initializes a new instance of the <see cref="TempFile"/> class and retrieves a handle to the file.</summary>
+		/// <param name="dwDesiredAccess">The desired access.</param>
+		/// <param name="dwShareMode">The share mode.</param>
+		/// <param name="dwCreationDisposition">The creation disposition.</param>
+		/// <param name="dwFlagsAndAttributes">The flags and attributes.</param>
+		public TempFile(Kernel32.FileAccess dwDesiredAccess, FileShare dwShareMode, FileMode dwCreationDisposition = FileMode.OpenOrCreate,
+			FileFlagsAndAttributes dwFlagsAndAttributes = FileFlagsAndAttributes.FILE_ATTRIBUTE_NORMAL) : this(string.Empty) =>
 			hFile = CreateFile(FullName, dwDesiredAccess, dwShareMode, null, dwCreationDisposition, dwFlagsAndAttributes, IntPtr.Zero);
-		}
 
+		/// <summary>Initializes a new instance of the <see cref="TempFile"/> class with the specified contents.</summary>
+		/// <param name="contents">
+		/// The text inserted into the file. If this value is <see langword="null"/>, the file is not created on disk.
+		/// </param>
 		public TempFile(string contents = tmpstr)
 		{
 			FullName = Path.GetTempFileName();
 			if (contents is null)
 				File.Delete(FullName);
-			else
+			else if (contents != string.Empty)
 				File.WriteAllText(FullName, contents);
 		}
 
+		/// <summary>Initializes a new instance of the <see cref="TempFile"/> class with the specified extension and contents.</summary>
+		/// <param name="ext">The file extension.</param>
+		/// <param name="contents">
+		/// The text inserted into the file. If this value is <see langword="null"/>, the file is not created on disk.
+		/// </param>
+		public TempFile(string ext, string contents = tmpstr)
+		{
+			FullName = Path.Combine(Path.GetTempPath(), $"tmp{Guid.NewGuid():N}.{ext.TrimStart('.')}");
+			if (contents is not null)
+				File.WriteAllText(FullName, contents);
+		}
+
+		/// <summary>Gets the full path of the temporary file.</summary>
+		/// <value>The full path of the temporary file.</value>
 		public string FullName { get; }
+
+		/// <summary>
+		/// Gets the file handle if created with the <see cref="TempFile.TempFile(Kernel32.FileAccess, FileShare, FileMode,
+		/// FileFlagsAndAttributes)"/> constructor.
+		/// </summary>
+		/// <value>The file handle.</value>
 		public SafeHFILE hFile { get; }
 
+		/// <summary>Releases unmanaged and - optionally - managed resources.</summary>
+		/// <returns></returns>
 		void IDisposable.Dispose()
 		{
 			hFile?.Dispose();