C calls dynamic ES1en32.dll to extract the Lha suffix for packaged file sharing

public class LhaUtity
    {
        /// achieve DLL The version of the 
        [DllImport("unlha32")]
        private static extern UInt16 UnlhaGetVersion();
        /// <summary>
        /// ' achieve DLL Implementation of 
        /// </summary>
        /// <returns> The success of </returns>
        [DllImport("unlha32")]
        private static extern  Boolean UnlhaGetRunning();
        /// <summary>
        /// ' File check 
        /// </summary>
        /// <param name="szFileName"></param>
        /// <param name="iMode"></param>
        /// <returns></returns>
        [DllImport("unlha32")]
        private static extern Boolean UnlhaCheckArchive(String szFileName, Int32 iMode);
        /// <summary>
        ///  File decompression 
        /// </summary>
        /// <param name="hwnd"></param>
        /// <param name="szCmdLine"></param>
        /// <param name="szOutput"></param>
        /// <param name="dwSize"></param>
        /// <returns></returns>
        [DllImport("unlha32")]
        private static extern int Unlha(int hwnd, string szCmdLine, string szOutput, int dwSize);
        /// <summary>
        ///  Files to unzip 
        /// </summary>
        /// <param name="archiveFile"> Unzip file path </param>
        /// <param name="extractDir"> Unzip to the path </param>
        /// <param name="isDeleteFile"> Whether or not to delete </param>
        public static bool UnCompress(string archiveFile, string extractDir,bool  isDeleteFile)
        {
            string extractFullPath = string.Empty;
            string startPath = AppDomain.CurrentDomain.BaseDirectory;
            if (!System.IO.File.Exists(archiveFile))
            {
                // Determine whether the file to be unzipped is saved or not 
                throw new Exception(string.Format(" It needs to be uncompressed {0} There is no ", archiveFile));
            }
            try
            {
                UInt16 ver = LhaUtity.UnlhaGetVersion();
            }
            catch (Exception ex)
            {
                throw new Exception(" Did not find Unlha32.dll file ");
            }
            if (UnlhaGetRunning())
            {
                throw new Exception("DLL Being performed ");
            }

            if (!UnlhaCheckArchive(archiveFile, 0))
            {
                throw new Exception(" The file cannot be decompressed ");
            }
            // Unzip the path 
            if (string.IsNullOrEmpty(extractDir))
            {
                extractFullPath =string.Format(@"{0}{1}\", startPath,archiveFile.Substring(archiveFile.LastIndexOf("\\")+1,archiveFile.IndexOf(".lha")-1-archiveFile.LastIndexOf("\\")));
            }
            else
            {
                extractFullPath = extractDir;
            }
            if (!System.IO.Directory.Exists(extractFullPath))
            {
                System.IO.Directory.CreateDirectory(extractFullPath);
            }
               

            int ret = Unlha(0, string.Format("x \"{0}\" \"{1}\"", archiveFile, extractFullPath), null, 0);
            if (ret != 0)
            {

                if (ret == 32800)
                {
                    throw new Exception(" File unzip and cancel ");
                }
                else
                {
                    throw new Exception(" File decompression exception ends ");
                }
            }
            else
            {
                if (isDeleteFile)
                {
                    System.IO.File.Delete(archiveFile);
                }

                return true;
            }

        }
}

In the project, I need to decompress this type of file, so I have no way to start. I find that it is one of the commonly used compression algorithms in Japan by looking at data on the Internet.

Looking up a lot of information, there is no good way to unpack,

Later I found this dll can be unpacked

But the code on the web is VB or C

Only the C# version itself, even though C# calls the dynamic linking library

Download the dll and place the DLL in the C:\Windows\System32 directory