True
Thanks for your help! 

I tried everything, opening it on a different machine did not work at all, same for exporting privkeys: qt says it doesn't have the privkey for the adresses, which shows me that there seems to be a bigger problem than the "all the privkeys could be read" message suggests.
I kind of made my peace with it...my stupidity lost me some BTC 
Thanks anyways!

Hey, sorry for not responding. I will try this in about 5 days, since I am not at my home PC right now (where the wallet is).
Thanks for your suggestions!  Will report back!

I have an interesting problem with a recovered and encrypted wallet.dat:
Was messing around with my wallets and accidentally deleted a wallet.dat with some BTC on it, which is idiotic, I know
When using Recuva, I could regain the same wallet.dat from about a month ago, and, luckily, Bitcoin-qt tells me the following when opening it:
"Warning: error reading wallet.dat! All keys read correctly, but transaction data or address book antries might be missing or incorrect."
The wallet loads (client rescans, which takes some time) and my balance is there. Some adresses and transactions are missing, but the balance is right!
Still, when I want to send coins, the password for decrypting the wallet seems to have changed! I know my wallet PW from that wallet for sure and didn't change it anytime. Tried so many variations anyways (didn't work), still I am sure that I KNOW the password, but it just doesn't work any more (maybe because of the recovered wallet.dat??). I used special characters and "Umlaute" (ü, ä, ö) in the passphrase; could it be that the problem is because of that?

Thanks in advance guys, maybe you have an idea to solve the problem.
Kinda shitty...was so happy to recover the wallet.dat and now cannot access and unlock it.

WT8P9xygDcn17Gxz76wc3PYFLeQvdEhaYP

muchas gracias