Those files are mainly found in the \Windows\Help folder. GID files are index files the help engine creates when one accesses the Find tab. You can safely delete them since the index will be recreated when you again access the Find feature. It is normal that GID files show a generic icon and are not associated with Help.

Note that intuitive boolean searches are possible on the Find tab: you can type one word and after hitting the spacebar a list of secondary words associated with the first one will appear automatically! 

Indexed searches are a great help for those Help files you access frequently, as they allow you type in any word you are looking for and result in displaying all help topics inside which the word occurs. 

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