The412Banner 06502bb49b Components: choices enforced at every game launch; Steam's tool-0 probes get their own prefix per Proton ...

Steam runs its graphics probe through every registered Proton at once after login, all in
compatdata/0. Prefix system32 links point into the Proton that set it up last, and the other
Protons' Wines, running outside Proton's pfx.lock, wrote their builtin DLLs through them into that
Proton's tree (device: GE's FEX DLLs became Proton Experimental's at session start).

- bannerlator-steam-compat: both wrappers (Valve's depot launcher and the third-party
  bannerlator-proton-wrap) give a tool-0 run STEAM_COMPAT_DATA_PATH=.../compatdata/0-<tool>, and
  before every other launch check the Proton's files against the app's desired.tsv and put back
  anything that differs (same Proton build only), logging to reapplied.log.
- ComponentsManager writes desired.tsv plus unpacked copies of the packages in use into the
  runtime after every change; the page and the drawer show 're-applied at launch'.

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..

desktop

Steam desktop UI on the desktop; Big Picture's Switch to Desktop works

2026-09-25 08:59:06 -04:00

overlay/usr

Components: choices enforced at every game launch; Steam's tool-0 probes get their own prefix per Proton

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preload

Bring the runtime up to date with Bannerlator, and end a session the way proot can survive

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