Which countries in Europe ban "I" flight plans to non-IFR airports?

Yankee wrote:

you won’t get an IFR approach clearance if the tower is closed

That is correct, however the original question was not on the operational side but on whether you can file I, and that works, they don’t check tower opening hours before approving flight-plans. Outside TWR opening, the only question local the local area controller has is “where do you plan to cancel IFR?”. They help you descend towards the IAF, but beyond that you need to be in VMC and A/A at the destination.