Files with opl file extension might be found as source codes in Psion OPL programming language.
OPL file extension - Open Programming Language source code
What is opl file? How to open opl files?
File type specification:
The opl file extension is associated with the Open Programming Language, an embedded programming language for programming Symbian and Psion applications.
The opl file stores source code written in OPL.
This opl 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.