Installing user customizable files

[topus]

I using a setup program generated from Visual Studio 2005 to redistribute my program. The msi resulting setup program install exe, dll and some html files in the end user pc. The html files work like default files and the user can change this files according your convenience. The problem is that when the user try to modify this html files at the startup of the exe file's appear a message box that inform the end user that some files is changed and a setup cd is requested to reinstall the program. Any people as a suggestion to by pass this problem? Realy each file must be unchanged after the installation? Thanks in advance ad sorry for the poor english.