/usr/lib/R/site-library/pwt8/INDEX is in r-cran-pwt8 8.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | pwt8.0 Penn World Table 8.0
pwt8.1 Penn World Table 8.1
|