Dev OS v0.3.3

Choose which file types open in Dev OS Editor.

Settings → Editor now includes Open files with Editor. Enter extensions or exact filenames, separated by commas, such as .ts, .tsx, .json, .md, Dockerfile; *.py is also supported. Apply changes to use them immediately when opening files from Dev OS Files or Quick Open. Other files continue using the system's default application. An empty list uses system defaults for all files.

Matching ignores case and supports compound extensions such as .tar.gz. Existing editor settings receive the new default field without a settings migration. Includes settings JSON editing and the Use latest version runtime switch from earlier releases.

Validation: build/type checks, configuration, extension, updater and Store integration tests; 9 native React GTK and 25 desktop UI tests, including custom file associations and changes applied without restarting Files.

Install from Settings → Updates, save your work, then select Use latest version and confirm. Built-in desktop apps close during the switch. Sessions older than v0.3.1 require a first manual restart with .\dev.ps1 updated on Windows/WSL or bin/dev-os-updated-session --nested on Linux.