.SYS

.SYS file extension

This is the basic program to work with .SYS extension

Notepad++

Notepad++ Notepad++ Document

Notepad++ is a source code editor and Notepad replacement for Windows. It uses Scintilla for code editing and syntax highlighting of about 80 different programming languages. You can also define custom rules for the formatting of normal text, keywords, comments, numbers, etc... (more)

The program works with the following extensions: js, sys, htm, ini, log, xml, nfo, css, dat, php, html, c, m, h, vb, pl, as, cs, fx, sh, me, mx, py, nt, rc, diz, for, ctp, cfg, sql, pas, tex, vbs, unk, lzx, asc, gcm, cpp, nsi, ses, f90, cxx, jsp, f95, cmd, mfp, hpp, hxx, inc, scp, bsh, inl, wtx, bas, nsh, mak, conf, java, phtml, readme, htaccess and xevgenxml