I figured the X would make it blank, and the changing FOV in console, then saving, would overwrite those Xs with real values. I assumed the guy was trying to insert the lines into the INI without any value, perhaps to make the console overwrite and save the lines.
OK, so now we're finally making sense of it. The description made it too confusing, that's for sure.
That supposed permanent FOV fix is bogus. It violates the following value rules I discovered and added to the STEP Configuration Settings guide:
The fov settings only accept floating point numbers. X is not a number, so the setting will be read as not equaling anything (i.e., blank), which will reset it to its default value, which is 65.
I put the info in about the decimals, etc. because I wasn't sure why he would not just use one X. He used a specific number for each of the three lines, and I believe one of those lines had a decimal place, with more Xs afterward.
I'll see if I can dig up the link.
EDIT: Link I was trying to dig up was in fact the link Z already posted on the previous page, Preserving FOV in Skyrim.
Edited by Nebulous112, 23 November 2015 - 04:36 PM.