Hi Harm
The default LSH3 widescreen mod works with no problems at all.
I have just had a Windows 10 update to v1603 and it is working fine.
I have had an email from LSH3 support that the latest Windows update Creator v1703 has caused a problem with the widescreen mod.
Until this is fixed it will delay LSH3-2017 being released.
LSH3 support do not have Windows 10 and I cannot presently help them until my system updates to Creator.
Microsoft is I believe currently updating those who purchased Windows 10 on systems and dvd with those who updated from Windows 7 to Windows 10 to be updated later.
Peter