This guide will let you play Bioshock Remastered in 16:10 with correct proportions: no longer vertically stretched.

The simple logic of my workaround-fix is: the game will now play in a centered forced borderless window (game had no native option for this), adding top & bottom black borders (AKA "letterbox") to keep correct aspect ratio as any other 16:9-only game played on a 16:10 screen does (in my case on a 2560x1600 16:10 native screen, and game set to 2560x1440 16:9).

IMPORTANT NOTE (FULL SCREEN)
This guide is mainly for those playing with a NVidia (Advanced) Optimus (iGPU+dGPU) system in borderless window mode.
For those instead who want to play in full screen mode and with correct proportions, you'll have to force also NVidia non-resized/scaled screen mode change (don't confuse it with rendering Scaling option!). So, to keep 16:9 aspect ratio on a 16:10 full screen you'll have to set the options in picture:
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or Bioshock Remastered will always be vertically stretched filling the whole native screen resolution viewport, despite you temporarily changed Windows desktop resolution to a 16:9 res (f.e. 2560x1444 16:9)!
This is the only way to force this game in full screen + letterbox 16:9 (black borders on top & bottom and correct aspect ratio).

👀 Notice that to be able to change SCREEN BRIGHTNESS slider, you'll have to run the game in full screen + this patch (or just "Disable fullscreen optimization") + dGPU-only mode. Won't work if you start the game in (Advanced) Optimus mode even if the game then uses dGPU!

Since an image is better than thousand words here is a comparison (2560x1600 screen):
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BEFORE: (ugly, stretched vertically)

AFTER: (fixed, with black borders up and down and correct aspect ratio)

🖼️ click for a direct comparison[imgsli.com]

Look at the UI elements (crosshair, circles are now rounded, not oval)...

👎🏻 Downsides: performance could be a bit worse than fullscreen mode on some systems. Brightness adjustment option not working and greyed out (because you're actually in borderless window mode).


Example for a 2560x1600 16:10 screen (tested on my ROG SCAR 18 G834JY, desktop in Optimus mode/Auto).

1. Download* this sdb file[1drv.ms] from my OneDrive and import it with MS Application Compatibility Toolkit 32-bit (AKA Compatibility Administrator, AKA MS-ACT). Import (Open...) the .sdb patch. Save the SDB somewhere (e.g. C:\Windows\AppPatch\ ). Right mouse button (rmb) over the yellow database icon and choose: Install, to install it among installed applications (yes you'll find it in the usual Windows installed apps panel). MS-ACT is not required after you installed the .sdb patch (because the fixes will be added to the registry).
   
   👉🏻 This patch at default sets the screen to 2560x1440. You can change it once loaded in MS-ACT: right-clicking on the tree on the right area choose "Edit Application Fix...", go to the fixes page (press Next two times), find the selected fix ForceDisplayMode, and click on Parameters button... Yes, unfortunately you'll have to customize it for your HW specs if you use a different resolution.
   
   ⚠️ SDB files are generated by a Microsoft official tool, and are used by Admins to patch applications (same as when you set Properties/Compatibility modes), so some paranoid AV can report it's a dangerous file since can change app behavior: false positive, we perfectly know we're going to patch a broken game.
   For more details on how to use this tool please, have a look to my other guide for Max Payne.
   
   * if you already applied my other Bioshock 2 Remastered stability workaround-fix with a SDB file, just load this one from MS-ACT, and copy/paste the additional patches present in this fix: ForceDisplayMode (parameters: "2560,1440"), ForceSimpleWindow into the other .sdb.
   
   
2. Edit %AppData%\BioshockHD\Bioshock\Bioshock.ini as follows (e.g. for a 2560x1600 16:10 screen):
   
   [WinDrv.WindowsClient] WindowedViewportX=2560 WindowedViewportY=1440 StartupFullscreen=False WindowedViewportYPosEditor=0 WindowedViewportXPosEditor=0 WindowedViewportYPos=0 WindowedViewportXPos=0
   and, if still starts in fullscreen, in-game select windowed mode, quit and relaunch the game.

Done!