Hi Cassarn,
By legal disks I was referring to disks for installing Windows 3.1, Windows NT, Windows 95, Windows 98, Windows 98se, Windows 2000, Windows ME, Windows XP, etcetera all the way up to Windows 8.1
You'll need legal disks given you would still need to register the installation.
From what I could tell your particular version of MYOB was coded to work with Windows XP (Service Pack 3), so theoretically if you installed Windows XP (Service Pack 3) you could then install MYOB onto the same Virtual Box and run it, thus being able to access your database.
As for MYOB itself, I have no idea whether you have to register it as you install it. If you do then sure, you'd need a legal copy of that too.
As for other old applications, games, etcetera. If you know which version of Windows they were coded to run with, then yes, installing that version of Windows and the application or game would in theory work fine.
You can also install a Virtual DOS Box and run old DOS games too Or a Virtual Commodore 64 environment. (actually that reminds me there was this one game with 100+ levels I never mastered
)
The other possibility is that someone has created a Third Party application designed to open documents from MYOB. Such an application may work within the Windows 10 OS, so you could look into that via Google, Bing etcetera. Similar to how there are various programs that will open a MS Word doc, or docx files but those programs are not actually Microsoft Word.
If such a third party application does exist, just make sure you read the Terms of Service, and Privacy policies of the application creator, and should you choose to download and install the Third-party program,
before installing, run a
Virus Scan on it.
Regards,
Regedit32