This method is for those who, like me, wish to permanently set a standard first-person shooter FOV in Halo2-Vista, in order to enjoy a better single player experience. It has been tested and works perfectly in H2V, and seemingly in Halo PC as well.
The short version:
- replace all occurrences of 'AA619C3F' with 'CDCCCC3F' in all SP .MAP files.
The detailed version:
- before you do any editing, make sure to BACKUP your entire Halo2\maps directory
- get a decent hex editor (I used hex workshop)
- open your Halo2\maps directory
- for every one of the single player maps (the ones whose filename starts with numbers) do the following:
- open the .MAP file with hex workshop
- choose replace in the edit menu
- in the type box choose: hex values
- in the 'Find' field type: AA619C3F
- in the 'Replace' field type: CDCCCC3F, a 32-bit float value which translates into a decent FOV of 1.6 instead of the default 1.22. Use other float values if you prefer.
- make sure to replace all occurences
- save the file
- close the file
- do the exact same procedure for these two other files: single_player_shared.map, shared.map
- you're done, launch the game and enjoy a permanent non-debilitating FOV in Halo2 Vista

Note: due to new FOV, wielded weapons appear slightly oversized.
Edit:
For me, modding this game really pumped some new life into it. I never thought I'd enjoy it so much. I just finished a run through the entire game, for the first time in a PRISTINE fanboy joy. And without the looping music, the game's dramatic atmosphere emerges at last. A huge thanks to
lone wolf, for his support,
T1xAnton, for his guidance, and
grimdoomer for his Gravemind editor, without which this would not have been possible.
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