Download and install the latest version of Filestar.
Right click on one or more Umx file(s) on your desktop and select Convert with Filestar.
Type convert to mp3 in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.umx -c "convert to mp3" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.umxContract.umx
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
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Let your AI agent convert UMX to MP3
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the UMX files in my Downloads folder to MP3”
Or run it yourself:
filestarcli -i file.umx -c "convert to mp3"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert UMX to MP3?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.umx -c "convert to mp3" on your computer, so your files stay on it.
UMX (Unreal Music Package) is a container format used by the Unreal Engine to store music tracks, typically encapsulating tracker-format audio data such as S3M, XM, IT, or MOD. It allows game music to be packaged and referenced alongside other Unreal engine assets. It is primarily used in games built on the Unreal Engine 1 and 2 for background music playback.
An MP3 file is an audio file saved in a compressed audio format developed by the Moving Picture Experts Group (MPEG) that uses "Layer 3" audio compression. It is commonly used to store music and audiobooks with near-CD quality sound (stereo, 16-bit) and roughly 1/10 the size of a .WAV or .AIF file.
