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 flac in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.umx -c "convert to flac" (how).
Documents - File Explorer─☐✕
This PC › Documents
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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 FLAC
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 FLAC”
Or run it yourself:
filestarcli -i file.umx -c "convert to flac"
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 FLAC?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.umx -c "convert to flac" 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.
A FLAC file is an audio file compressed in the Free Lossless Audio Codec (FLAC) format, which is an open source lossless audio compression format. It is similar to an .MP3 file, but is compressed without any loss in quality or loss of any original audio data.
