Won't let me change owner.   See attached png for error.  MSSMS cant attach mdf (access error ....);

PS D:\program files\Microsoft SQL Server-2\MSSQL11.ROMEXIS\MSSQL\DATA> get-acl .\Romexis_db.mdf | FL

Path   : Microsoft.PowerShell.Core\FileSystem::D:\program files\Microsoft SQL

Server-2\MSSQL11.ROMEXIS\MSSQL\DATA\Romexis_db.mdf

Owner  : BUILTIN\Administrators

Group  : OFFICE-PC3\jack

Access : BUILTIN\Administrators Allow  FullControl

NT AUTHORITY\SYSTEM Allow  FullControl

NT SERVICE\MSSQL$ROMEXIS Allow  FullControl

Audit  :

Sddl  ...