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I bought myself a bigger monitor with 2560x1440px resolution and I want the image previews to be biiiig but they seem to be limited to 256px size at "extra large" setting. Fullscreen at max size it fits 9x5 files.

I tried changing the DPI setting from 100% to 200% and it doesn't change the max size of image file previews, only all buttons and texts get bigger.

There was advice about adding thumbnail size value to registry key Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer dword "ThumbnailSize" and it didn't work with 512 (hex 100).

Is there a working way to increase max preview size in explorer for a modern Windows 10 version (1809) or should I look for an image gallery browser app? I really like the convenience of having all the default Windows Explorer hotkeys and controls though, but if there's no native way then I'll consider third-party apps.

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