I found wallet, but its format is not DAT, but XPT...
I used search tool (
https://ninjastic.space/search) and found out there's 0 post which mention "XPT" in 2008-2010. Closest thing i found is x.pushthrough (XPT) protocol which used on some mining pool. But that protocol looks like only exist since 2013.
But I changed WALLET.XPT to dat format, but BITCOIN CORE can't scan it.
Renaming the extension actually doesn't change the format. So it's not surprising Bitcoin Core can't open/scan it.
Also, I tried to scan the hard drive with PYwallet, but PYwallet closed quickly after opening. How to solve it?
What command did you use? Did you see any warning or error message?
No, it just opened and closed quickly, so fast that I don't even know what happened.
Pretty sure that the wallet.xpt file is just part of Mozilla Firefox. I would be very surprised if this was in any way related to Bitcoin and/or Bitcoin Core.
If you open the file in a text editor and it starts with the text "XPCOM TypeLib" and then a bunch of "garbled characters", then it is 100% NOT a Bitcoin Core wallet file.
OK, thank you. I will try to scan the hard disk with pywallet again. If I don't find the wallet, it will be regarded as my contribution to bitcoin combustion.