Created attachment 141756 [details]
A test file for reproducing the issue.

SUMMARY

In Dolphin, if I double-click a tar.zst file, Ark opens up showing the contents of that archive. However, if I try to open a vma.zst file, Ark errors with: No suitable plugin found.

Both of these are .zst files! Even though I don't expect Ark to know what a vma files is, I do expect it to allow me to extract that .vma file from the .zst, just as command line zst allows:

zstd --decompress test.vma.zst

Go here for screenshots:
https://forum.proxmox.com/threads/vma-archive-restore-outside-of-proxmox.14226/post-418

More about VMA is here:
https://pve.proxmox.com/wiki/VMA

STEPS TO REPRODUCE
1. sudo apt install zstd
2. Download attached file test.vma.zst
3. Open the the test.vma.zst file with Ark

OBSERVED RESULT
No suitable plugin found.

EXPECTED RESULT
Display the .vma file.

SOFTWARE/OS VERSIONS

Linux: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION

This may be in issue with zstd instead of Ark. I'm not sure.