Skip to content

Fix Twemoji, Fluent UI & Catmoji Emoji Presets Not Working in Bloxstrap

Step-by-step fix if Twemoji, Fluent UI & Catmoji Emoji Presets fails to load or gets overwritten in Roblox on Windows.

How-to • Updated 17 October 2026 • 1 min read

Download for Windows

Bloxstrap requires the Microsoft .NET 6 Desktop Runtime to be installed

Frequently asked questions • Release notes

Screenshot showing how Bloxstrap can be used to replace the Roblox mouse cursor
Mods change local assets like the cursor, and survive Roblox updates.

Why Twemoji, Fluent UI & Catmoji Emoji Presets stops applying

If Twemoji, Fluent UI & Catmoji Emoji Presets does not appear in-game, either Roblox is still running in the background while you saved settings, or a conflicting file inside `%LocalAppData%\Bloxstrap\Modifications` is overriding `content/fonts/TwemojiMozilla.ttf`.

Close `RobloxPlayerBeta.exe` completely in Task Manager before clicking **Save** in Bloxstrap Settings so the bootstrapper can write the file on the next launch.

3-step repair checklist

  1. Open **Bloxstrap Menu** → **Mods → Emoji preset**, toggle the option off and back on, and click **Save**.
  2. Check Open Mods Folder to verify no corrupted 0-byte file sits at the same relative path.
  3. Ensure you are launching Roblox through Bloxstrap (or update your install from /download) rather than the Microsoft Store app.

Frequently asked questions

Why did my mod disappear when I launched from the browser?

If the official Roblox updater overwrote your protocol handler, launch **Bloxstrap Menu** once and click Save so Bloxstrap re-registers `roblox-player://`.

Does Bloxstrap need administrator rights to apply this mod?

No. Both Bloxstrap and Roblox live inside your user `%LocalAppData%` directory, which is writable by standard Windows accounts.

Get more out of Roblox

Bloxstrap is an alternative launcher for Roblox with extra features and mods.

Download for Windows

Back to Twemoji, Fluent UI & Catmoji Emoji Presets