Description of Problem: Attempted restore fails. Error: Cannot load wallet(1): UnicodeDecodeError('UTF-8', )............ then a bunch of what looks like header information. \x00\x10\x80\
This is generally a sign that the wallet you are attempting to open is not an Electrum wallet... or it is severely corrupted.
This is some of the contents of the file.
Created By Insun Kang, Young-Seok Kim, Kyoung-Gu Woo, Heegyu Jin, Kyung-Sub Min, Taewon Lee, Dongseop Kwon, KyungWha Hong, Shin HoChul, Ki Yong Lee, DongJin Choi, Ilhwan Choi, Dongjoon Hyun, Seokjin Hong, Ki Yong Lee, SangJung Woo, Hyoungmin Park, Chuho Chang
And this is 100% a sign that the file you are attempting to open is not an Electrum wallet file... or a Bitcoin Core wallet.dat file either.
As far as I can tell... you seem to have an "Ace.dat" file... which seems to be linked to
Samsung Smart TVs, PVRs and Cameras... for example:
The "database" folder contains only 2 files: ace.dat and ace.log. The two files are binary. Ace.dat starts with:
AceDB Created By Insun Kang, Young-Seok Kim, Kyoung-Gu Woo, Heegyu Jin, Kyung-Sub Min, Taewon Lee, Dongseop Kwon, KyungWha Hong, Shin HoChul, Ki Yong Lee, DongJin Choi, Ilhwan Choi, Dongjoon Hyun, Seokjin Hong, Ki Yong Lee, SangJung Woo, Hyoungmin Park, Chuho Chang
I suspect it is part of a Samsung proprietary "video" encoder.
Where exactly did you get this ".dat" file from? Did you do some data recovery on an old USB stick or something?