Sometimes the field of view (fov) for a game can be found in hexadecimal form in one of the game's files. The format you will most likely see is the IEEE 754 standard which is comprised of four hexadecimal pairs.
For example a fov of 60.0 would be the following in hexadecimal.
42 70 00 00
This will almost always be formatted to be read from right to left in the game's files. So 42 70 00 00 becomes the following in the file.
00 00 70 42
You can use a IEEE 754 calculator like
this one to get your fov value into hexadecimal format. Simply paste your fov in the decimal field and click the Rounded or Not Rounded button (should not matter) and look at the hexadecimal result under the single precision fields.
Think of the hexadecimal value in this format.
ST UV WX YZ
You will be using it in this format.
YZ WX UV ST
Remember you can calculate the field of view by using the
FOV Calc tool on this site along with any of several other methods for calculating the field of view.