Thanks for a sensible answer
Note that an app for Windows 10 will run on both desktop and phone as there will no longer be separate executable files and everyone using Windows Phone will be upgraded to Windows 10 for free when it arrives, so developing a single Windows 10 app will cover a huge number of users, desktop, phone, tablet, xbox, if the Windows 7 and Windows 8 users all take advantage of the free upgrades. In a years time it will be the Windows XP compatible software which will have the low requirement so it is probably sensible to target Windows 10 when you get around to windows.
I think people expect the next file to be locked too as they often press the button in the middle of an event and want the conclusion kept, in fact in a lot of the videos that get posted people seem to press the event button when they first see something interesting developing in which case the next file is probably the most important.