A solution to this problem can be found in Quality Central 61394, which was originally introduced by Jordan Russell.
There is a bug in Delphi 2007 that prevents directories added to the .Net library search path from being written to the EnvOptions.proj file. This does not seem to be a problem for the Win32 library search paths.
To solve the problem, manually edit the EnvOptions.proj file. In a typical Windows Vista installation, this file is located in the C: \ Users \ username \ AppData \ Roaming \ Borland \ BDS \ 5.0 directory, where username is the name of the user who installed RAD Studio 2007.
RAD Studio 2007. EnvOptions.proj (notepad.exe ). , DotNetLibraryPath. , , .