operating system - Is there a part of a windows file that can't be modified? -


i'm trying accomplish let user download file web application onto system. file contain unique 5 digit code. using unique 5 digit code users can search file in file system.

i'm wondering best place put 5 digit code in file users can search file. simplest approach put in name of file, however, users can change name of file easily.

i'm looking filed can put code users won't able modify still able search it. possible?

if file.. kind of file format mean. i'm asking because file pile of bytes , can append 5 digit code every in file, if own file format. if tell file format use, there fields can used search it. example tiff has many tags. images have other meta data. etc


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