There are 2 other file types using
the PL1 file extension!

empty icon.pl1 - 3D Home Architect room plan

empty icon.pl1 - Adventure Maker plug-in file

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PL1 file extension - PL/1 programming language source file

What is pl1 file? How to open pl1 files?

File type specification:

Source code and script file type icon Source code and script file type

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.

Help how to open PL1 files:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert file with extension PL1:

As far as we know, this .pl1 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

Related links:

PL/1 programming language full overview and samples

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