Library File Formats
There are three library file formats available that are as follows, .PLL, .PLX, and .PLD.
1. .PLL
A library .PLL file holds both library compiled and the source code, platform specific p-code (executable code). A .PLL file is created or updated when it is saved in the library module. When the library module is saved, the modifications are reflected in each module to that the library is attached.
2. .PLX
A library .PLX file is a platform-specific executable. Whenever an application is ready to be deployed and there would be a requirement to produce a version of library files which contain only compiled p-code.
3. ,PLD
The .PLD file is a text format file and can be used for technical documentation of the library files.