env!("CARGO_MANIFEST_DIR") returns the correct path but starting with \\?\ (e.g. \\?\C:\path\to\project\) making the path unusable.
How I can solve that ?
tl;dr It's required to have path longer than 260 characters on windows.
After some tests it's look like the problem wasn't the \\?\ but the fact I used .. (double dot) in the path string.
You need
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