WinZip® uses the standard Windows "Common Dialog Boxes" as a basis for the Add dialog box. Due to a limit in the Common Dialog Boxes the total length of all selected files cannot exceed 2000 characters. You have exceeded or may exceed this limit. You can circumvent this limit by using the Drag and Drop interface to add files instead of the Add dialog box, or by specifying wildcards in the File name field in the Add dialog box (for example, *.c).