This file is indexed.

/usr/share/mc/skins/sand256.ini is in mc-data 3:4.8.15-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This skin demonstrates how to use 256 colors in mc.
#
# As a prerequisite, you will need to:
#   1) Have a terminal emulator that supports 256 colors (a few examples:
#      xterm, Gnome terminal and other VTE derivatives, KDE's Konsole;
#      iTerm for Mac OS X, PuTTY for Windows).
#   2) Adjust your TERM variable accordingly, e.g.: export TERM=xterm-256color
#      Verify by running tput colors
#
# Each of the 256 colors has two names, you can use whichever you prefer.
#
# One possibility is to use the names "color0" to "color255" to access every
# color directly based on their number.
#
# The first 16 colors ("color0" to "color15") can also be specified by their
# names (these names are already being used by mc for 8/16 color terminals):
#   black      gray
#   red        brightred
#   green      brightgreen
#   brown      yellow
#   blue       brightblue
#   magenta    brightmagenta
#   cyan       brightcyan
#   lightgray  white
# Note that with 8/16 color terminal settings (such as TERM=xterm), colors
# of the second column can only be used for the foreground, and their actual
# interpretation varies across terminals. Some terminals show the colors
# from the first column instead (that is, you only have 8 colors), but make
# them bold. Others show the brighter version (16 foreground colors). Yet
# others make them bold and bright at the same time. Switching to 256 colors
# should end this ambiguity: you should have 16 separate colors according to
# their names, none of them are bold by default but any of them can be
# switched to bold, and all of them are available for background, too. This
# is the intended behavior, the actual behavior might vary across terminals.
#
# Colors of the 6x6x6 cube ("color16" to "color231") can alternatively be
# referred to as "rgb000" to "rgb555", all three digits ranging from 0 to 5,
# corresponding to the R, G and B color components.
#
# The 24 grayscale colors ("color232" to "color255") have the aliases "gray0"
# to "gray23".
#
# In addition to the 256 colors, the special word "default" means the
# default foreground or background color of your terminal, while "base" means
# mc's main colors. A missing value means falling back to the _default_ of the
# given section.
#
# Following the foreground and background colors, the third (optional) value
# can specify special attributes to enable. Valid values are bold, underline,
# italic, reverse and blink. Append more with a plus sign, e.g. "bold+italic".
# Leaving the field empty makes it fall back to the attributes of _default_.
# Use any other word (e.g. "none") to prevent fallback and disable all flags.
#
# Italic support requires a recent enough ncurses (>= 5.9.20130831) or slang
# (>= 2.3). All attributes are subject to support by the terminal emulator.

[skin]
    description = Sand skin using 256 colors
    256colors = true

[Lines]
    horiz = ─
    vert = │
    lefttop = ┌
    righttop = ┐
    leftbottom = └
    rightbottom = ┘
    topmiddle = ┬
    bottommiddle = ┴
    leftmiddle = ├
    rightmiddle = ┤
    cross = ┼
    dhoriz = ─
    dvert = │
    dlefttop = ┌
    drighttop = ┐
    dleftbottom = └
    drightbottom = ┘
    dtopmiddle = ┬
    dbottommiddle = ┴
    dleftmiddle = ├
    drightmiddle = ┤

[core]
    _default_ = black;rgb554
    selected = ;rgb452
    marked = rgb400;;italic
    markselect = rgb400;rgb452;italic
    gauge = ;rgb452
    input = ;rgb452
    inputunchanged = gray;rgb452
    inputmark = rgb452;gray
    disabled = gray;rgb553
    reverse = ;rgb452
    commandlinemark = white;gray
    header = red;;italic

[dialog]
    _default_ = black;rgb553
    dfocus = ;rgb452
    dhotnormal = ;;underline
    dhotfocus = ;rgb452;underline
    dtitle = ;;italic+underline

[error]
    _default_ = rgb554;rgb320;bold
    # "black" might change color when going bold, so use "rgb000" instead
    errdfocus = rgb000;rgb452;bold
    errdhotnormal = ;;bold+underline
    errdhotfocus = rgb000;rgb452;bold+underline
    errdtitle = ;;bold+italic+underline

[filehighlight]
    directory =
    executable = rgb030
    symlink = rgb202
    hardlink =
    # 404 Not Found :)
    stalelink = rgb404
    device = rgb231
    special = rgb331
    core = rgb430
    temp = gray15
    archive = rgb012
    doc = rgb103
    source = rgb310
    media = rgb024
    graph = rgb033
    database = rgb421

[menu]
    _default_ = black;rgb452;italic
    menusel = ;rgb551
    menuhot = ;;italic+underline
    menuhotsel = ;rgb551;italic+underline
    menuinactive =

[popupmenu]
    _default_ = black;rgb553
    menusel = ;rgb452;underline
    menutitle = ;;italic+underline

[buttonbar]
    hotkey = black;rgb554;italic
    button = black;rgb452;italic

[statusbar]
    _default_ = black;rgb452;italic

[help]
    _default_ = black;rgb553
    helpitalic = green;;italic
    helpbold = red;;bold
    helplink = blue;;underline
    helpslink = blue;;reverse
    helptitle = ;;underline

[editor]
    _default_ = black;rgb554
    editbold = rgb400
    editmarked = ;rgb452;italic
    editwhitespace = rgb400;rgb553
    editlinestate = ;rgb553
    bookmark = ;rgb551
    bookmarkfound = ;rgb530
    editrightmargin = rgb400;rgb553
#    editbg =
    editframe = rgb530;
    editframeactive = black;
    editframedrag = rgb400;
    window-state-char = ↕
    window-close-char = ✕

[viewer]
    _default_ = black;rgb554
    # "black" might change color when going bold, so use "rgb000" instead
    viewbold = rgb000;;bold
    viewunderline = ;;underline
    viewselected = rgb400;rgb452

[diffviewer]
    added = ;rgb450
    changedline = blue;rgb553
    changednew = rgb400;rgb553
    changed = ;rgb553
    removed = ;rgb511
    error = rgb554;rgb320

[widget-common]
    sort-sign-up = ↑
    sort-sign-down = ↓

[widget-panel]
    hiddenfiles-sign-show = •
    hiddenfiles-sign-hide = ○
    history-prev-item-sign = «
    history-next-item-sign = »
    history-show-list-sign = ^
    filename-scroll-left-char = «
    filename-scroll-right-char = »

[widget-scollbar]
    first-vert-char = ↑
    last-vert-char = ↓
    first-horiz-char = «
    last-horiz-char = »
    current-char = ■
    background-char = ▒