appcrash_bitcoin-qt.exe
bitcoin-qt.exe
bitcoin-0.8.1-win32.zip
bitcoind.exe
bitcoin_testnet.png (green bitcoin logo)
bitcoin.ink
Most of those are just part of the Bitcoin qt client, now known as Bitcoin Core. The zip file probably contains the installation for Bitcoin qt. The .png file is the image file for the logo. .ink is also some sort of image extension I think.
Might all that be something interesting, to warrant further investigations. Or should I be fine with the wallet.dat file.
The wallet file is the only thing you should care about. Everything else are just files left on the disk from a time you had the Bitcoin QT client installed on your computer.