/usr/bin/xclip-pastefile is in xclip 0.12+svn84-4build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
set -e
if [ "x$1" != "x" ]; then
echo "Usage: $0" >&2
exit 1
fi
xclip -selection secondary -o | gunzip -c | tar xv
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