Steam start popup: pick the engine below

[Turuk Makto]

I get above mentioned popup with a choice of 10 engines to pick from and have no clue what Steam wants from me.

OS: Linux Manjaro

Except for dosbox no engine rings a bell but I dont know why I would need a dosbox-staging either.

Does anyone know what this is all about?

Choices:
scummvm, doesbox-staging, easyrpg-player, Gadot, Ren'Py, ruffle, MW.js, RetroArch (Snees9x, PCSX ReArmed and other).

For sure I wont use an ARM engine, even if I would know what it is for.