Windows Username: Sławomir (pay attention to the ł)
User Folder: C:\Users\Sławomir

Poco::Environment::get("LocalAppData") returns "C:\Users\Slawomir\AppData\Local"
It should return "C:\Users\Sławomir\AppData\Local"

_wgetenv(L"LocalAppData") returns C:\Users\Sławomir\AppData\Local - which is correct.

Poco 1.9.0-release - Windows 10.