It depends. The trouble is, The Secret Files was released by different publishers as two different executables, with all their functions and so on in subtly different locations in memory. The same JJ2+ patch you already have works with the version of The Secret Files that does not have a startup screen that mentions "LK Avalon" and does not include a Polish translation. If you have those things, though, it's incompatible and the patch will not work on it.
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