>Yes Fred,
>SET HELP is ON, SET HELP TO (path and name to may Help.CHM is corect).
>But I forget to say that I use Install-us Pro to SetUp my application. I install all files needed to run HTML Help (Hh.exe, Itircl.DLL, Itss.DLL, HhCtrl.OCX) but , like I said nothing happens. When I use Setup Wizard and install only HTML Help engine (no application or other) Help begin works perfect. May be I not install some files, or not register them (ActiveX controls HhCtrl.OCX I register). Can You give me some advise what I must do ?

There may be registry entries necessary that are not built by the self-registration of the help components. We see this frequently in other places installing VFP6; in fact, as a part of the VFP6 distribution, there's a small .REG file that contains a template for building some registry keys needed to launch VFP6 applications by file association, that aren't a part of the self-registration process for the VFP6 runtime files. You're told what needs to be done (you have to look very hard for it, just like you have to actually read and understand the VFP6R.DEP file correctly to not rely on Setup Wizard to do the runtime install), and Setup Wizard incorporated the necessary functions in its install, but if you choose not to use Setup Wizard, it's your responsibility to build the keys and understand the dependencies. Microsoft isn't responsible for supporting some other vendor's tools for you.

As I've mentioned elsewhere, the decision to use a third-party installer is not one to be taken up trivially, and if your installer doesn't do the job right, I'd take it up with your install tool vendor. It's not Microsoft's responsibility if your vendor doesn't provide a capability that they do in Setup Wizard!

Remember what I've said in the past; not understanding the install process and your install tool makes you better than even money to screw up installation. Sounds like that's the problem here.