.PL1 file extension - PL/1 programming language source code
What is pl1 file? How to open pl1 files?
File type specification:
The pl1 file extension is associated with the PL/1 programming language.
PL/1 was developed as an IBM product in the mid 1960's, and was originally named NPL (New Programming Language). The name was changed to PL/1 to avoid confusion of NPL with the National Physical Laboratory in England.
PL/1 was the first large-s cale attempt to design a language that could be used in a variety of application areas.
The .pl1 file stores source code written in PL/1 programming language. Various programming languages store source codes in simple text files. Try any text editor to view content of PL1 file.
This pl1 file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.
