Why Windows 10’s New Fluent Design Icons Sparked User Backlash
Microsoft’s Windows 10 Dev Build 21343 introduced new Fluent Design System icons for File Explorer, but users criticized the mismatched look because the Explorer UI itself wasn’t updated, leading to a stark contrast with other operating systems that integrate their icon sets more cohesively.
Windows 10 Dev Build 21343 – Fluent Design System icons
Microsoft released the Windows 10 Dev Channel build 21343. The preview does not introduce new functional features, but it replaces the default File Explorer icons with a set created according to the Fluent Design System (FDS). The new icons are colorful and follow the Fluent aesthetic that has already been applied to built‑in apps such as Notepad.
Icon changes
The update swaps legacy glyphs for the following categories:
System‑wide icons (e.g., network, power, volume)
Folder and file type icons
Device‑related icons (e.g., camera, printer)
All new icons are extracted from the OS image and displayed side‑by‑side with their legacy counterparts for visual comparison.
User feedback
Many users criticized the new icons because the visual style of File Explorer itself was not updated. The colorful icons appear visually jarring against the classic Explorer UI, creating a mismatch between icon design and surrounding controls.
Microsoft roadmap
Microsoft has indicated that the icon refresh is only the first step. Future updates will continue to replace system icons until the entire Windows 10 UI adopts the Fluent style. According to the roadmap, the full set of Fluent icons is expected to ship with the Windows 10 21H2 (Fall 2021) release.
Comparison with other operating systems
Similar icon overhauls in other OSes receive fewer complaints because the new glyphs match the overall system theme. Examples include:
Ubuntu – its icons are integrated with the Ubuntu desktop theme.
UOS (UnionTech OS) – icon set aligns with the system’s visual language.
Deepin – the icon design is consistent with the Deepin UI.
Extracted icon catalog
The preview also includes a complete catalog of the newly extracted icons, grouped by type. The catalog shows both the new Fluent icons and the legacy versions for reference.
Technical note
The preview’s icon assets can be extracted from the OS image using standard resource extraction tools (e.g., Resource Hacker or 7‑zip) and are stored under the C:\Windows\Resources\Themes\...\Assets directory. Developers wishing to test the new icons can replace the legacy files in a sandboxed environment to evaluate visual integration.
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