If I remove adom.acc, it works, but I don't really want to create a new account.
With adom.acc in steam directory:
Log:
<2023-05-18 21:52:59> INFO : Ancient Domains of Mystery (version 3.3.4, release 102)
<2023-05-18 21:52:59> INFO : -------------------------------------------------------
<2023-05-18 21:52:59> INFO : Initializing Steam
<2023-05-18 21:52:59> INFO : Steam API initialization
<2023-05-18 21:52:59> INFO : Steam set debug handler
<2023-05-18 21:52:59> INFO : User logged on check
<2023-05-18 21:52:59> INFO : Steam user is logged in
<2023-05-18 21:52:59> INFO : Starting Steam background process
<2023-05-18 21:52:59> INFO : Creating Steam background process
<2023-05-18 21:52:59> INFO : Detecting Steam player name
<2023-05-18 21:52:59> INFO : Current player name Petalwing (115892563)
<2023-05-18 21:52:59> INFO : Steam process started
<2023-05-18 21:52:59> INFO : Ghost transfer called
<2023-05-18 21:53:02> ERROR : Could not fully read the account data.
<2023-05-18 21:53:02> INFO : unable to load music file: Khelavaster's Prophecy.ogg
“Roads were made for journeys, not destinations.” - Confucius
"Buy the ticket, take the ride..." - HST