A question - is it works in HSFX5.0? Yes or no, please!
Yes it works on HSFX5.
The il2fb.exe has not changed since Pacific Fighters version of the program as far as I know. The ones "cracked" by QTim to allow modding, etc., were the same too. These ones for "different memory sizes" only modify subtle memory configurations or enable the >2Gb flag of the exe header.
These are not MODs in the sense of a MOD made of code running over the version 4.10.1, 4.10, 4.09, 4.08... of the game, etc., it loads before everything, so it doesn't really know which version of the game you have, which MODs, packages, etc.
And the fact which one is better is quite ambiguous, some people claim to have impreoved their fps count, others don't, etc. It seems that there is no general rule about this, because the program launcher (il2fb.exe) is so old that no real memory use consideration was taken, so these are not clearly applicable tweaks, but some aparently receive a benefit, so why not to use them.
Regards,
Pablo