player.wad is the file that contains all the stats that you can look via "View Player" in the game menu.
Some of the contents of player.wad can't be viewed in game. Notably:
* The number of times each enemy has killed you.
* The number of kills you have racked up with each weapon.
So, I present to you playerview.jar (attached), a program designed to display those hidden contents. To use playerview.jar, make sure you have java installed (probably at least 1.6 is needed), then put playerview.jar in your DoomRL directory and run it.
(There are a few things playerview doesn't show: total played time and maximum reached depth for each game type. These can be added by request, but they didn't seem worth the trouble of finding a nice way to show them.)
Edit: Updated for 0.9.9.6