Are .wallet files specific to the software or can I use it on any software?
For example, if I am using Multibit and use Multibit to create a .wallet and put BTC in that wallet, can I then run Electrum and open that .wallet file in Electrum and still have my BTC with the same address, same file, everything?
Also, what is the best wallet to be using? I had Multibit but they are ending support. Does it matter what wallet I have my BTC in on August 1st to ensure that I have BTC from both/all forks (assuming it forks)? Obviously an offline wallet, but does it matter if it's Multibit/Electrum/etc wallet?
Also, supposedly the private keys are kept in wallet.dat but I have wallet.wallet not wallet.dat. What is the difference between wallet.wallet and wallet.dat?