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IlMerge-GUI represents a graphical interface for IlMerge, an older tool released by Microsoft to join multiple .NET assembly into a single piece. It supports executable files and DLLs, and it provides several handy configuration settings when it comes to the processing job and output filetype.

To be able to run IlMerge-GUI, it's necessary to have Microsoft IlMerge installed. As previously mentioned, it's an old product. Originally compatible only with Windows 2000, Server 2003, XP, Vista and 7, IlMerge can still be downloaded from Microsoft's official website. The GUI also supports IlRepack.

Installing the GUI isn't required because it comes in a portable package. You just have to double-click the downloaded .exe to reach the main app window immediately. It autodetects the IlMerge installation and prompts you with a message if it's not detected.

The graphical interface is clean and intuitive, consisting of one window that shows all options put at your disposal. A large area on top is reserved for dropping multiple selected .NET assemblies, in order to modify settings for them.

IlMerge can be asked to copy attributes, internalize, sign with a key file, union duplicates, and to merge XML documentation. It can also generate a log file with all activity details, as well as product a command-line file.

Besides specifying the output directory and format of the new, merged assembly, it's possible to enable debugging mode, as well as to select the .NET Framework version from a drop-down menu.

The entire merging operation shouldn't take long but this solely depends on IlMerge as well as your PC's hardware abilities. The GUI doesn't bring anything new to the table except for the clear-cut environment with intuitively placed options, making the Microsoft IlMerge tool accessible even for users who are not familiarized with the console workspace.