Hey there. I recently made an open source tool that will, among other things, automatically figure out the version prefix from metadata inside the wallet and dump out the contents. You can find it here: https://github.com/jimtje/walletlib
Although if you already know that your public key starts with a W, the version prefix byte is going to be either 72, 73, or 74. Just looking on Github, these may fit the bill, although not sure if they date back to 2014. Basically, the coins on these search results (there are quite a few):