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INVALID_HANDLE_VALUEis a WinAPIsm that shouldn't have been used in the first place. Building transgui with Lazarus 4.0 fails due to this constant being moved/removed. According to the documentation, the "official" return value fromFileOpenon error isTHandle(-1)but digging into the implementations themselves reveals that the symbolic constant for this is https://www.freepascal.org/docs-html/rtl/sysutils/feinvalidhandle.html .Also don't check if the file exists before opening it as that's just classic TOCTTOU.