To link from a contents or index entry to a topic in another compiled help file

Open a contents (.hhc) or index (.hhk) file, and then click Add if you are adding a new entry or Edit if you are changing an existing one.
In the File or URL box, add the following syntax:
```
ms-its:file name.chm::/topic.htm
```
where file name.chm is the name of the compiled help file and topic.htm is the name of the HTML file to which you want to link.

Make sure that the compiled help file you want to link to is located in the same directory as the file you are linking from.

Notes

The MS-ITS protocol works with Microsoft Internet Explorer 4.0 or later. If your users have Internet Explorer 3.0 installed, they need to use the following protocol, which also works with later versions of the browser: mk:@MSITStore:file name.chm::/topic.htm.
If you want to link to a compiled help file that is located in a directory on the Web, you need to provide the full URL including the HTTP address. For example, ms-its:http://www.sample.com/file name.chm::/topic.htm.