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..can be used in a path to indicate 'go up one folder', I would hazard a guess that somewhere along the line, some program or script concatenated two strings to create a path, one ended with.., and the next began with.., and since it used one of the techniques mentioned below, it succeeded in creating the path, even though it was missing the folder separator between them.GET /....\\....\\....\\....\\....\\....\\....\\....\\....\\winnt\\win.ini. Clearly there is/was some vulnerability somewhere that this attempts to exploit..., not..... It's simply a way to traverse to\winntregardless of the depth of the starting point (the web root), so long as the starting point is less than 9 levels deep. It relies on the fact that going..from the root directory leaves you at the root directory...which was why I found this one rather odd.