Hi
There are lot many third party resources by using which you can easily create the help files(.chm files).
few of them are
http://www.softany.com/winchm/chm-maker.htm[
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http://abeetech.com/chmmakerpro/[
^]
after successful creation of your help file copy that file on to the bin folder of your application.
Then use the following line of code to open the file
FileStream fileStream = new FileStream(@"c:\file.txt", FileMode.Open, FileAccess.Read);