The CorelDRAW vector drawing and illustration utility uses the IPL extension for files containing spot color palettes. These files contain a number of references to user-defined colors, which are thus available in several documents.
The files can be loaded and saved from the palette window. These files are also known as the Corel Pantone Spot Reference Palette.
Most often resolving problems with opening IPL files is very simple. Just install an appropriate program that supports such files. All of the listed programs support IPL files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of IPL files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate IPL files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the CorelDraw Graphics Suite applications is not on the list, select "Browse" option in order to manually locate the directory where CorelDraw Graphics Suite has been installed.
Sometimes problems with opening IPL files may not lie with the application itself, but can arise due to other causes, such as: