Legacy software on Windows 10

I didn't realise Excel 2007 cannot do proper ALT-TAB.

Here is the solution:-

1. Open Registry Editor (Win+R followed by regedit)
2. Go to: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
3. Create a new 32-bit DWORD value named AltTabSettings and set it to 1
4. Sign out and sign back in again (or restart)

Thanks to:-

https://answers.microsoft.com/en-us/windows/forum/windows_10-start/alt-tab-in-windows-10/e736770c-0f32-42c4-ba15-ca128e30d3df