What is .HELP file extension?
File used by Help Viewer, a help documentation viewer included with Mac OS X; contains a bundle of documents, which may include HTML and CSS files as well as indexing information; commonly used for Mac OS X application help documentation.
Help books may be localized for different languages. For example, a help book may include subdirectories for English (e.g., /English.lproj/ directory) or Spanish (e.g., /Spanish.lproj/ directory) translations.
HELP files are commonly included within Mac OS X application bundles (.APP files).
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.