feat: add support for many common extensions (not exhaustive)
[subcommands: mp4, jpg, png, mkv, wav, pdf, asm, blend, bmp, bz2, c, class, conf, cfg, cpp, cc, css, csv, db, deb, desktop, diff, dtd, gif, gz, h, html, htm, jar, java, kwd, ksp, kss, log, m3u, m4a, m4p, md5, md5sums, mo, mpgor, mpeg, ogg, patch, php, phps, phtml, pl, pls, pov, properties, ps, py, pyo, pyc, rdf, rs, go, rpm, rtf, sh, so, tar, tgz, ttf, txt, xbel, xsd, xml, xsl, xpm, zip, help]