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The executable for Color Efex Pro 4 will be found at ".Program Files→ Google → Nik Collection → Color Efex Pro 4 → Color Efex Pro 4 (64-bit) → Color Efex 4.exe" If you installed the Nik plugins to the default location in Windows the executable (.exe) files for each module should be at the following location where each module's executable will be nested within the folder for that module. When you use Nik as a plugin the host application must convert the raw files to either jpeg or tiff before sending them to the Nik plugin. Note that none of the Nik plugins support raw files. If you have the folder with the executable file (NOT the plugin file) for a specific Nik suite plugin open on your desktop and drag a jpeg or tiff file and drop it onto the executable file (NOT into a window where you have opened the executable file) a window with the plugin will open with the photo loaded. Although they can be run alone, the plugins were not designed to be used as a standalone application. Yes they can, but there are some significant caveats.
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