A YDL file generally works as a program’s own data store to retain lists, queues, task states, or settings for future sessions, and its contents vary widely—some are plain text with JSON/XML or URLs, others are binary blobs meant only for the original software—so the simplest way to identify it is reviewing where it came from, where it’s stored, how big it is, and which app Windows associates with it, then opening or exporting it from that same program if it’s binary.
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web site. When people use the term "data/list file" for a YDL, they mean it holds structured lists the program needs instead of something you read like a doc, functioning as a list or queue—URLs, batch files, playlist items—together with info such as titles, IDs, sizes, dates, statuses, error logs, retry counts, and output paths so the app can restore state, avoid rescanning, and preserve consistency; it may appear as plain text (JSON/XML/lines) or binary for compactness and safety, but either way the purpose is to guide the software’s workflow, not to be opened directly by users.
Common examples of what a YDL file might store include resources the program processes in order—URLs, files, IDs, playlist entries—together with metadata such as names, sizes, dates, tags, or source paths and task-level settings like output directories, format choices, or retry limits, enabling the program to reload state instantly; it may also act as an index/cache to avoid rescanning and track progress states (pending/complete/error), ultimately functioning as a machine-friendly record that combines items with their context for the software’s use.
A YDL file is most often a program-created "working file" that functions as internal plumbing rather than something intended to be opened manually, typically holding a job’s items—download links, playlist entries, batch tasks, library IDs—plus surrounding context like titles, sizes, timestamps, location paths/URLs, settings, and progress labels, explaining its presence near logs and caches that help the app reload sessions, resume work, and prevent duplicates; some YDLs are readable text while others are binary, but the purpose stays the same: a machine-friendly container that preserves items and their workflow details.

In real life, a YDL file typically acts as a hidden workflow record the software uses internally, holding downloader queues with URLs, output names, folders, and progress states, or storing media-collection items with metadata like titles, durations, thumbnails, and tags; some tools treat YDL as a batch-recipe file listing inputs and options, while others use it as a cache/index to skip rescanning large folders, and in every case the file exists so the software can restore lists and states across sessions rather than be opened manually.