The command-line parameters will be truncated to a length of 255, even though the operating system may support bigger command-lines. The Objpas unit (used in objfpc or delphi mode) define versions of Paramstr which return the full-length command-line arguments.
When the complete command-line must be accessed, the argv pointer should be used to retrieve the real values of the command-line parameters.
For an example, see Paramcount (543).