To give you the specific purpose of a file, I need you to share the file with me or tell me the name and content of the file you are referring to. Once you provide that, I can tell you:
What it does (e.g., configures a program, holds data, runs a script).
What program uses it (e.g., Excel, Notepad, a specific system app). Whether it is safe to delete or modify.
If you are looking for how to write a purpose statement for a document, it should be a concise, one-or-two sentence declaration in the introduction that clarifies the document’s topic, goals, and desired outcomes. Please share the file name or context! Writing Effective Purpose Statements