Control panel items are linked to a CPL file. Files with cpl extension are Windows control panel applets. Open over 400 formats with File Viewer Plus. Each panel is represented by a single .cpl file. Advanced users execute CPL files from command line. Double-clicking launches feature that file contains. Useful tools: File openers, converters, viewers and editors. While Compel Presentation is a CPL-file, we know 3 uses: different software, different data. Install an app supporting CPL to open. Visit site and download installer. Search 25,000 extensions: what it is and how to open view or convert it.