This file is indexed.

/usr/include/X11/bitmaps/grid8 is in xbitmaps 1.1.1-1.

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

The actual contents of the file can be viewed below.

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#define grid8_width 8
#define grid8_height 8
static char grid8_bits[] = {
   0x55, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00};