Since JNLP files are simply Java Web Start files that open applications through an Internet browser, any browser that works in Windows 8.1 will open a JNLP file as long as you have Java installed.
A compressed version of files, popularly known as zipped files are convenient but also prone to errors. So, when you attempt to open such files using freeware ...
When trying to open a large file, around 500 MB to 2 GB, applications like Notepad and Notepad++ fail as they do not support these file sizes. Notepad was meant to take a quick look into smaller log ...