Why is there no pgn file with all openings and its main lines?

I searched the internet for three hours, but could nowhere find a simple collection where all the openings are collected with their main lines. First I thought lets download some app where all the openings are explained. But no such thing exists. But not even some pgn file? I mean there are three million chess books, but no one had the idea  to put together a pgn file with the most important openings and its main variations?? 

Here U can find the list of main lines by ECO codes:

https://www.365chess.com/eco.php

Most books are not free.

Same for pgn files...

Then show me pgn files with all openings that I can buy. I am willingly to pay money for it! There is all this beautiful technology, but no one cares to put together a openings library for beginners to learn? It is ridiculuos.

@Yigor, thanks! That looks nice, but they are no pgn files. Also, I wish the lines would go a bit deeper. When I watch a chess tutorial on YT where they analyze some grand master game, they go through the first ten to fifteen moves very quickly and say that's all theory, that's all from the books. But why can no one put all these lines together in a pgn file for people to learn them on a computer screen?! It's 2017!

Aren't you just looking for a database?  The most played move in any given position is theory; when you get down to only a few games played for a particular move, you have exited theory.  Do a search to only include 2500+ ratings and you know it's not just amateurs playing something unsound.  Refine the search to only include the most recent year or two and you'll have current theory.

It's worth pointing out that the 'simple' idea of listing all openings and all main variations would make up a comprehensive opening encyclopedia.  Even without diagrams these would encompass hundreds of pages.  Trying to cram all that information in a single .pgn file would be chaotic and barely usable from a practical standpoint.  If you spread it out across multiple .pgn files ... then you have a database.

"Theory" is moves that have been played before.  Chessbase's Megadatabase has a large number of games, and there is Gigaking from ChessOK.  For recent games, you can download them in PGN from Mark Crowther's The Week in Chess website for free.

If you want to learn about openings, you might want to try a book that explains the ideas behind the moves such as Paul van der Sterren's Fundamental Chess Openings.  It's probably a lot easier to remember moves if you know why they are considered good.

There are also openings encyclopedias such as Nick De Firmian's Modern Chess Openings 15th ed. if you just want to see an overview of some of the most popular lines.

Here is Kingbase for SCID and SCIDvsPC.

Lars Balzar has links to a bunch of downloadable chess game archives.

Thanks everybody! My first post/question in this forum and I really appreciate all your very helpful replies!  @SmithyQ and @wayne_thomas, makes sense what you wrote

Chesspublishing.com!

If you want all openings, $99 for 1 year.  TONS of PGN files!  You can also get discounted prices by only subscribing to 1, 3, or 6 of the 12 sections.

So many PGN files on that site you'll swim in them and drown!

Try pgnmentor.com.  They have a large game database sorted by openings and opening variations, and it's free (they do try to sell their pgn reader however).

PGN files are oriented towards individual games with analysis sidelines, not to opening trees.  If you have a pile of PGN files and want to create an openings database from them, you need to import them to an application like Chess Openings Wizard.  In each position, it shows you the different moves that were played in the games that you imported, and it handles transpositions (the same position reached by different move orders).

i'm working on one now, but it's a few years away from finishing...

Opening books for computers have most ECO openings.  The bigger it is, the more lines it will contain, and, normally, the harder it is to read.

Hey. I was thinking that maybe we could set up an online project where people submit the openings from NCO that they have inputted into their computer? For example, if you have saved the moves from the Scandinavian (Introduction) page 124 then you could upload that file and it would get added to the full database. In terms of resources, it could be done using some sort of Wiki-type page or even GitHub. I don't think one person could complete the project - and stay mentally stable! But I suspect many of us have already converted the openings we play/study from NCO into Chessbase (or whatever software you use). What do you guys think? Any ideas or appetite?

Here you can download a huge free pgn library of chess openings classified by their ECO code

http://www.dii.unisi.it/~addabbo/ECO_aperture_scacchi.html

go to chessable you get free stuff also short and sweet series of IMson all the major openings and if you digested those you can pay for bigger stuff there

That's awesome, just what I was searching for, thank you.

buy chessbase

I think you missed my sarcasm...