This adds XDG desktop portal integration for Wine file dialogs, with compatibility fallbacks, and solves https://bugs.winehq.org/show_bug.cgi?id=51134 I used an LLM to create the patches, the wiki does not contain an LLM policy, so I don't know if this is eligible to be merged at all. I used the following sources: - https://github.com/MicrosoftDocs/win32 which contains the markdown sources for e.g. - https://learn.microsoft.com/en-us/windows/win32/menurc/resource-compiler - https://github.com/MicrosoftDocs/sdk-api which contains the markdown sources for e.g. - https://learn.microsoft.com/en-us/windows/win32/api/commdlg/nf-commdlg-getop... - https://github.com/flatpak/xdg-desktop-portal - https://github.com/notepad-plus-plus/notepad-plus-plus to determine what calls are made when choosing Save As, since it initially didn't work - Wine logs from manual testing after adding extensive TRACE calls: - Wine `notepad.exe`: `GetOpenFileNameW` / `GetSaveFileNameW` via portal - Wine `wordpad.exe`: `GetOpenFileNameW` / `GetSaveFileNameW` via portal - [`hammerplusplus.exe`](https://ficool2.github.io/HammerPlusPlus-Website/index.html) (32-bit): `IFileDialog` (`IFileDialog2_fnShow`) Open/Save As via portal - `SumatraPDF.exe`: Open via `GetOpenFileNameW` in auto; Save As uses `GetSaveFileNameW` and falls back in case of the auto policy, but uses portal when forced (WINE_FORCE_PORTAL=1) - `notepad++.exe`: `IFileDialog` (`IFileDialog2_fnShow`) Save As via portal after result-path handling fixes Implementation: - Add a portal backend in `comdlg32` for file open/save requests - Add portal handling for `GetOpenFileNameW`, `GetOpenFileNameA`, `GetSaveFileNameW`, and `GetSaveFileNameA` when requests are compatible with portal features - Route compatible `IFileDialog`/`IFileOpenDialog`/`IFileSaveDialog` paths through the portal - Keep native Wine dialogs in case of unsupported/customized dialog options - Add a combobox to `winecfg` to select the policy for XDG Desktop Portal file dialogs: auto / always / never {width=900 height=486} {width=900 height=486} {width=485 height=600} -- v4: comdlg32/tests: add IFileOpenDialog FOS_PICKFOLDERS runtime check https://gitlab.winehq.org/wine/wine/-/merge_requests/10060