As of 5.0 (August 6th, 2020) this is slightly changed: instead of a folder of the campaign's name, the state.ini filename is prefixed with the campaign's name.
Now:
...\Documents\1C SoftClub\il-2 sturmovik cliffs of dover\mission\campaign\source.campaign-name.state.ini
("source" is either bob, tobruk, or custom; on update from 4.57 existing campaign state.ini are automatically transfered into the new format when you enter the campign page first time).
Old (for reference):
...\Documents\1C SoftClub\il-2 sturmovik cliffs of dover\mission\campaign\campaign-name\state.ini
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