NFO Viewer

NFO files typically store data related to your Windows computer, related to system information and diagnosed problems. While these files can be accessed using Notepad, some of its ASCII design might not be visible correctly, and this is why a specialized app is required.
Such a solution is NFO Viewer, a handy utility that can help even novices open their NFO files without any hassle.

Straightforward and minimalistic GUI

The application comes with a user-friendly graphic interface, leaving plenty of room for the actual viewing of the NFO contents. Its layout is probably meant to provide as fewer distractions as possible, so as to encourage you to focus on examining the document.
You can open the source file you are interested in using the traditional way (browsing to its location) or you can drag and drop it onto the main window of the app.

Customize text and background colors

There are no genuine functions to speak of, other than the one related to modifying the colors used within NFO Viewer.
More precisely, you can personalize the color for the NFO text, along with the one of the background, so as to make it easier for you to analyze the displayed data.
You can experiment with several combinations until you find the one that does not seem aggressive to your eyes - however, make sure you remember the colors you liked best, since you need to set them again when you open the app once again, since it reverts to the original color scheme.

A handy NFO viewer, yet rough around the edges

The application does its job, that of showing you the contents of your NFO files without requiring too much effort on your side.
On the downside, its lack of options might be confusing to some users who might overlook the fact that the app also supports TXT and DIZ as the source files, not only NFO.