Will ASP.NET Framework 4.0 old applications work in future

Question

Hi,

 

We have an existing (Huge) application written in ASP.NET WEBFORMS . it is using .NET Framework 4.0. At present it is hosted on windows server 2012.  My question is, will this application work in future versions of windows servers  like Windows Server 2020   etc...  (After 5 years or 10 years.......)   ?

 

Will browers supports .aspx pages in future?