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Microsoft Help Project Files 

This reference documents the files included in Microsoft Help 2 projects and resulting compiled Help (.HxS) files. In particular, this reference focuses on the format and structure of author-generated files (input), instead of those generated by the Help compiler (output).

The information in this reference is intended for Help authors who want to manually create or edit Help project files, and for Help developers who want to write applications that can create and edit these file types.

The following table shows the project files, whether they are input or output files, and if they have an equivalent file type in HTML Help 1.x.

File type Input/output 1.x equivalent

CHM-to-Namespace Map File

Input

None

Attribute Definition (.HxA) File

Input

None

Collection Definition (.HxC) File

Input

.hhp

HxMerge Project (.HxM) File

Input

None

Include (.HxF) File

Input

None

Index (.HxK) File

Input

.hhk

Table of Contents (.HxT) File

Input

.hhc

Sample Definition (.HxE) File

Input

.hhs

Virtual Topic Definition (.HxV) File

Input

None

Compiled Help (.HxS)

Output

.chm

Compiled Help index (.HxI)

Output

.chi

Merged index (.HxW)

Output

None

Merged query (.HxQ)

Output

None

Combined attribute index (.HxR)

Output

None

Merged TOC (.HxH)

Output

None

Registered namespace list (.HxL)

Output

None

NoteNote

The new file name extensions for Microsoft Help 2 are not compatible with earlier versions of Help.

In adherence to the XML 1.0 specification, the tags and attributes defined in these files are case-sensitive.

If you author XML using an ANSI encoding, make sure that the encoding matches the current default locale identifier (LCID) of the operating system when the file is created. Failure to do this could cause a mismatch between the encoding specified in your XML file and the actual encoding of the file.

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