Posted by webmaster Guido on August 21, 2001
In Reply to: open a .cpl file posted by Delphilover on August
Not so long ago, I have answered to the same question in DelphiLand's "Q&A Forum" -- just look a few messages before your question ;-) But since this seems to be quite a popular topic, let's talk about some more CPL stuff.
The "Control Panel" window contains icons that represent various utilities to set up, personalize and "tune" your system. These utilities are officially called the "Control Panel Extensions", but are also referred to as the "control panel applets". Most of these "applets" ("small applications") were added by Windows' installation program, others are added when you install additional Microsoft software, and even non-MicroSoft software can add their own.
While varying in number and type for different computers, a lot of the well-known "Control Panel Extensions" are common to all Windows 32-bit systems, such as: "Add/Remove Programs", "Display" (also called by right-clicking the desktop and selecting "Properties"), "Date/Time" (also available through the system-tray popup menu as "Adjust Date/Time"), and so on.
When you click an icon in Control Panel, Windows launches the program CONTROL.EXE (sits in the Windows directory) with the name of a CPL-file as a parameter. The CPL-files are located in Windows' System-directory. On the PC that I'm writing this text on, Windows' "Find Files or Folders" utility found 20 of them. Note that you also might find CPL-files in other folders, but these do not correspond with "Control Panel Extensions", they just happen to have the same file extension (example: some CorelDraw files such as pantone.cpl and trumatch.cpl).
desk.cpl : Display Properties