Support of the WEBM video file format

There are functions in Windows that allow to take ownership without the need to run handmade utilities.
See also this forum, e.g.:

I just checked some WEBM files that downloaded from before my transition from Windows 7 to Windows 10. And they all under

Properties > Security > Advanced > Owner

have my new name that I came up for the User of my Windows 10

But even if I was checking this in a wrong way or my OS was feeding me [in whatever way] with false information [for whatever reason], then all the newly downloaded WEBM files should be visible in Mp3tag, right? But none are

Plus I do not get the "Cannot be Opened for Writing" message

But with the need to go file-by-file, as I am not able to select more than one file when wanting to access

Properties > Security


That was not the issue, I know. Taking ownership apparently is. Or at least I suspect that this is the issue.
You could try to rename an (mp3-) file of which you know that is usually found by MP3tag to the extension webm, add that extension to the usually read files and see if that file also appears.
That was the way that I tested it. And it worked, see

and as I said in that post: I suspect that it could have to do something with that. It does not mean that it really does.
It could also be that you do not add the extension in the correct syntax.
But all in all: it is not necessary to request to add the webm files as it already works in some respect.
If you want to get more support, see e.g. this external link:

Please note that the linked external thread recommends to use mkv containers - and they are already supported by MP3tag.

.. and you are making a mess of the security of your windows-installation.

I tested this thoroughly: going from MP3 to WEMB and the nto MKV, from MKV to WEBM and then MP3, etc.; while also adding data into tag fields, I used old and new files

As long I the end result was an MP3 or MKV format, it was beign displayed in Mp3tag

And going back to

It says there that I have this problem since Windows XP: I add files to the list in Mp3tag but they do not appear

Back then it was a case of MP3 files remade into MP333. It persists to this day. I even came up with a reverse test: I replaced MP3 with MP333 on the list. And guess what- MP3 were no longer loaded visible in Mp3tag but MP333 did not start to appear. And after changing MP333 to MP3

So aside from using other software for video, as a workaround I could / should rename all WEMB into MKV?

I really would like to be able to turn off all or almost all of that built in by Microsoft security, with a single click. To me the number of drawback on Windows 10 in comparison to Windows 7 is staggering- and many of them are on the account of security reasons. Unfortunately users are treated like idiots. I do not mind that- as long as there is an advanced option that says to the system "But I am not an idiot, I know what I am doing, so please bugger off with your kindergarten approach- and if I really do mess something then I have a multiple images of the OS to bring back the system in a working condition"

And if I have any doubts if what I think of Windows 10 has relation to reality, all I have to do is to compare the number of various registry hacks that I already have [and which number will increase in time ] with the number of the old ones for Windows 7

But thank you for your concern. [When I will restore the system, the Mp3tag folders will one again be guarded]

I really suggest you switch to another OS. We read so many complains about Windows from you. Why do you not really jump over to an OS that fits your need?

Do you really think that over 800 million users thinks they are "treated like idiots" and don't care?

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Me going form Windows 7 to Windows 10 was not what can be called a fully consent choice, as my machine broke down and it was easier and quicker to install a new system from scratch- every day without a computer was loosing me money. And taking into consideration than in the near future Windows 7 was not to be is supported anymore, the most logical thing was indeed to install a never version of the already familiar to me operating system. A switch was like that was anticipated [and disgusted] by me for months now but I suddenly found myself in a situation, where I simply had to do it, albeit not being fully prepared for it

Also: since Windows 95 I acquired many big and little pieces of software, which I use both work and my hobbies. Having to search for, test and configure new ones [as most of what I use is available only for Windows] would make this all more tedious and time consuming

As for the 800 000 000 users argument. I do not know if they all do not care or if they are unable to care or know what to care about. But I suggest that you google something like "are smartphones making people stupid" and then after reading some articles that answer YES to this question, compare the number of smartphone users to the users of Windows 10. The fact that for example in USA the Internet providers make a pretty bad job in comparison to e.g. Europe [I have a multiple companies to choose from that give me ability to download unlimited amount of data, while many people in US live in areas where there are only 2 companies and they narrow your transfer in a given month once you reach the data gap] does not mean that an Internet user can always just change a company for a better one

I can only speak for myself, so the fact that for example I had to use a simple third party software just to be able to stop for good updates of the operating system is a tell sign that I am treated as an idiot that does not know when to update his system. I know when to update my system: when I first test its updates and other changes to it, saving these updates / changes to a new image of it later on; and when I am not working at a given moment on an important and or time consuming task that cannot be interrupted in any way. What sense is there in making images of the system, if after restoring one you are forced to do an update. Idiocy at roam, nothing more. Internet is full people complaining about how a Windows 10 update made damages to their system. And back in the day some users were going back from 10 to 7. So I assume that some of these 800 000 000 users think they are being treated at least not seriously if not as idiots by Microsoft in exchange for they hard earned money

I know two professional photographers. One has a lot of computer knowledge and was using Linux for many years- but had to switch to Windows because more and more particular plugins he was using for both photography and video editing were available only for Windows. That was a long time ago. The second one does only images and was bragging for months about switching to iMac, because he was fed up with how slow Windows 10 was ans with how many issues. But after a weekend spent on testing iMac, he returned to his Microsoft run machine, only investing in a M2 drive for the system, thus replacing a SSD

So I can jump as high as I want, as long as I do not hit a virtual ceiling. I photoshop too; and I am about to jump into videoediting

So to answer your question: I would gladly jump- back into Windows 7. But that would cost me even more time and in a foreseeable future would left me with an outdated operating system. There was one main reason why I went from from Windows XP to Windows 7- it was the inability to use more than 4 GB of RAM. But back then I was surprisingly pleased with how Microsoft improved its system. And also now on Windows 10 I can use for example Direct X12, which for 5 years after its introduction was unavailable for Windows 7 users [but I expect that there will be Direct X13 and Microsoft will not make it usable on Windows 7, wanting to force its users to go to a never system]. So to be fair, there were some issues roaming my Windows 7 that became magically absent on the account of Windows 10. But far more new issues have appeared on it in comparison to its predecessor. And remembering how 7 was better than XP makes this even more unpleasant for me

I hope that my elaborated answer pleases all people who have had it with @Zerow spitting down on Windows 10 on this forum

What good should that be?
If you rename a jpg to txt, the picture does not become a poem.
It was just to test the case why you do not get the file types as listed in the options.
I do get webm files if I add *.webm
You do not get them, so find out what is weird on your machine.
Could it be some kind of antivirus program that blocks such files?
Is it the leftovers from a non-working "commander"?
I would have a close look at these local installations.

A workaround

I have no idea how it could blocked. I have no other such problems with files. It is not the files that are blocked but an option in Mp3tag does not work for me as it should- since Windows XP

How is that possible? It the same case as this

Nobody experiences it but me. Because apparently I have something messed up in my config files- a glitch that I drag along though all the updates of Mp3tag and reintroduce to every new installment of an operating system

[Still, after upgrades of Mp3tg and Windows 10, I am unable to see WEBM files in my Mp3tag]

What I completely do not understand is just, why more video format files cannot be simply displayed by Mp3tag by default?

If I take WEBM or AVI files and change in a file manager their extension to MKV, or just add "another" MKV extension to them, i.e. making now .WEBM / .AVI part of the FILENAME, I can load them to Mp3tag. And not only that, as I can also add data to made-up-by-me tag fields for such fake MKV files. That data can also then be copied to other video files in Mp3tag. Also that tag data is visible in Media Player Classic. And I can run my actions on those fake MKVs. And of course after all that I can change from .WEBM.MKV / .AVI.MKV back to .WEBM / AVI and see those tag fields still being filled up with data

So, at least from my point of view [which comes out from the Mp3tag functions that I use], everything seems to be working. Thus:

A] I can make this my workaround: simply rename all my non-MKV files to MKV

With a tool like FreeCommander this will take me something like 10 seconds. And I could also get rid of the original extensions, keeping them in form of tag fields just in case - while at the same time using a video editor that will be able to load fake MKV file into it [preferably with an info indicating true extensions of file formats]

B] What is the point of pretending that Mp3tag does not handle video formats other than MKV? Yes I know that MKV is a container, but then again- how to explain that changing file format fools the Mp3tag, thus "unlocks" the files for it?

This is somewhat similar to what I experience with a freeware audio converter called Switch Sound File Converter Plus made by NCH: by default it does not create handy convert entries in the shell menu for audio and video formats like TTA or M2TS. But after inserting proper entries in the Registry [modeled after those added there by the creators of this software] such file formats gain ''visibility'' for Switch in the right click menu thus are treated like ''basic'' file formats like MP3 or AVI. And what is also important here, TTA and M2TS files can be loaded to Switch for conversion even before such hacks of Registry are performed. So in other words: NCH for whatever reason chooses to hide for shell menu some file formats supported by its Switch

Could you show us an exact copy of the string that you use in
that lists the file types to be read by MP3tag?

Mine looks like this and it leads to MP3tag to read webm-files:
*.aac; *.ape; *.apl; *.asf; *.flac; *.flc; *.mp+; *.mp1; *.mp2; *.mp3; *.mp4; *.m4a; *.m4b; *.m4v; *.mpc; *.ogg; *.oga; *.ofr; *.ofs; *.spx; *.tak; *.tta; *.wma; *.wv; *.tmp; *.001; *.010; *.opus; *.dsf; *.mpg; *.wav; *.aif; *.aifc; *.aiff; *.mka; *.mkv; *.sfk; *.webm
Oh yes: and how do you open these files? With drag&drop or with the functions to open a folder?

It is [as just copied and pasted from my Mp3tag]
*.aac; *.aif; *.aifc; *.aiff; *.ape; *.apl; *.asf; *.dsf; *.flac; *.flc; *.m4v; *.mp+; *.mp1; *.mp2; *.mp3; *.mp4; *.m4a; *.m4b; *.mka; *.mkv; *.mpc; *.oga; *.ogg; *.ofr; *.ofs; *.opus; *.spx; *.tak; *.tta; *.wma; *.wv; *.wav; *.wav; *.webm; PLUS a pause at the very end, which pause this forum keeps hiding

[A funny thing, as it is the opposite in Mp3tg itself: every time I reenter Tools > Options > Tags > Tags> Restrict incoming files to: the pause removed previously by me at the end of the box is one again back there]

And yes, I tried loading up multiple thus somewhat different WEBM files, from different periods of time of creation and from different sources

This does not really answer

Also, I find that you have *.wav twice in the list. THis does not hurt but is redundant.

I simply missed that question, sorry for that

All that time I have been using drag & drop from FreeCommander or a send-to shortcut in FreeCommander. I also tested just now drag & drop from Windows Explorer - still nothing. But when I use now the "Add directory..." icon within Mp3tag, the WEBM files finally get loaded to Mp3tag

So. Does point into the direction of having something to do with what I ask about at the top of post How to send and drag & drop files to an audio editor? -OR- Problems with running as (not) administrator on Windows 10 above the [That would be a first solution] statement?

But both my Mp3tag and FreeCommander [and also explorer.exe] are shown to be running as No in the

Task Manager > Details > Elevated

And now, that I can finally load WEBM files at least in one way, what I have noticed in regards to

The WEBM files do not show to me theirs lengths- which is to be expected, as the supported video file format is MKV, right? But when those very same files are renamed be me into MKVs, they suddenly gain the ability to display length. [Although I cannot rename them without issues from within Mp3tag - the files must be tampered with in FreeCommander of Windows Explorer]

So once again: why al this pretending or "pretending" or whatever it might be called, that Mp3tag does not handle videos other than MKV?

This is not true as MP3tag handles MP4 files perfectly.
It is not enough to rename files from webm to mkv - you have to transform them with a suitable program.
After that you can tag the files.
Please note that a number of video files do not accept tags: avi, mpeg are such video formats. To add tags in a sensible fashion you have to transform these file types into taggable format.
The other problem seems to be curable with the use of the "open folder" function from within MP3tag.

By that statement I meant that Mp3tag pretends to not being able to handle specifically WEBM files

It is not just the tags but also the readability of lengths, as after renaming WEBMs to MKVs Mp3tag is suddenly able to display that data

But of course that renaming is not the same as converting. I myself did call this a a workaround and mentioned a fail safe when utilizing such approach

My tests have shown me that I can as well tag WEBM files renamed to MKV format

But that trick did not work for AVI

And that would explain why this workaround did not work for AVI

"Transform" as in apparently either convert or rename

It is not a cure, if a given problem persists. This is merely a workaround; which to me personally is too inconvenient to be used

This is a bug and your cure / workaround proves that claim. Because for adding certain videos files [WEBMs] one method [Add directory...] works while two other methods [drag & drop and send-to] do not - but at the same time all of three methods work for different video files [MKVs]

Just wanted to throw in an official statement, before this back-and-forth continues:

Mp3tag does not support WebM at the moment. Every file extension you're adding manually to the list of supported files makes the files with that extension to be recognized when listing files. However, this does not imply that metadata parsing is performed for such files.

My current understanding is, that WebM is basically a Matroska container (restricted to specific codecs for audio and video). So renaming a *.webm file to *.mkv works in this case.

I'll add official support for WebM with a future release. By then, it will be possible to handle WebM files with the *.webm file extension like any other supported file type with Mp3tag.

And regarding other false statements from this topic: AVI can have metadata, it's simply not supported by Mp3tag.


The WebM container format with .webm file extension is indeed a strict subset of the Matroska format, usually with .mkv extension. That means it is okay to test WebM like Matroska when reading, but special care must be taken when writing.


I've added support for WebM with Mp3tag v3.00c.


Seems be working A-OK

Thank you