This file is indexed.

/usr/include/X11/bitmaps/grid2 is in xbitmaps 1.1.1-2.

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

The actual contents of the file can be viewed below.

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#define grid2_width 2
#define grid2_height 2
static char grid2_bits[] = {
   0x01, 0x00};