I own a very old wallet.dat[1]. It is from a time when you had to compile some C files to a command line tool which downloaded the whole blockchain [2] to your computer locally.
I'm pretty sure I have never had to specify a password (or 12 random words). I remember this because it seemed odd to me back then.
What is the easiest way to check if this wallet.dat is intact and what is in there? [3]
I'd prefer if it would be possible to check without transferring it to a service (like Coinbase, or similar), but I'm open to that, if it is safe.
[1] Actually I have two different versions of it with slightly different sizes and couldn't figure out which is the most recent.
[2] I think it must be in my backups as well, but it is probably not of much use.
[3] I have a pretty good idea what should be in there and even know the Bitcoin address used. Still I would like to verify independently if my memory serves me right and if I could transfer the Bitcoins if I wanted to.