It is often not recommended to use any codec packs with editing programmes as they can sometimes interfere with the editors codecs. But if you haven't any to use then you have not much to lose.

A codec pack frequently mentioned is K Lite https://www.codecguide.com/download_kl.htm  If you decide to give it a try please let us know how you get on.

I am new to the group and I am in the same position as AlanM-R in that I have no record of the unlocking data for MoviePlus X6; the .mfu file which I can download from my old installation simply contain text 'SerifAVLockFile.

You suggest finding third party codecs but does anyone know where to place these in MVP or in Windows 11 so that they can be used?

As far as I can understand at the moment, and my understanding is very limited, when Serif ceased supporting MVP their licence to use the codecs was terminated. If this was the case is there any way others, such as this group, could repurchase the licence; and would anyone know what to do with it if "we" did?

I would be grateful if you would share your thoughts.
PeterLo

Unfortunately it puts you in the same position as many others.  You have a MVPX6 that won't read many files.

Alan, you seem to be making the situation with the mfu files complicated when it isn't. 

Have you imported your unlock codes (mfu file) into your new MVPX6 installation?

The problem is that i didn't have pre-existing mfu files before the computer went into dock. Unsurprisingly, given how long it is since  MP was installed, I have no recollection of having to unlock things, let alone export mfu files. Frustratingly it is something I could have done just before the repair if I had known it was going to be needed.

Have you imported your unlock codes (mfu file) into your new MVPX6 installation?  It's simply done but as Alfred said "that’s clearly no use to you if you now need unlock codes that you never obtained while there was still a mechanism for doing so"  Such a situation can occur if you are now using a more modern camera which requires codecs which weren't unlocked when MVPX6 was still unlocking.

Once you have your unlock codes imported we can work out what files you can unlock and find a way of making MVP usable for you.

The files I mentioned are indeed .mfu files, but only have the text context as noted.

Ah, OK, I’m with you now! Since the unlocking server is offline, we can no longer unlock previously unused codecs. The import/export procedure enables you to take unlock codes from your old machine and use them on your new machine, but that’s clearly no use to you if you now need unlock codes that you never obtained while there was still a mechanism for doing so.

I have had a look at that, but it relies on an 'unlocked' installation to find the codes. I did try the export from my installation, just in case, but the files (3 different locked modes) all simply contain text 'SerifAVLockFile'.

The export procedure should have resulted in the creation of a *.mfu file.

https://punster.me/serif/viewtopic.php?pid=4286#p4286

https://punster.me/serif/viewtopic.php?pid=2683#p2683