.rbxm file: how to open it on Windows

1 Windows app registers the .rbxm extension. Install one of them to open the file with a double-click.

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  Roblox Studio Mod Manager

  An open-source custom bootstrapper for Roblox Studio that allows you to override files in Roblox Studio's directory, opt into development branches of Roblox, and experiment with Fast Flags.

  Open source 2026.09.02 ★ 393

Related guide: Change the default app for a file type in Windows