User Guide

340
About Merge Modules
# Text Drop-down List
The installation author can select from a drop-down list to replace the
default value. This list displays only the name you gave the value, not the
actual value. This is useful when the values are not self-explanatory.
(Example: Use this option to make a property configurable. Possible choices
for the installation author could be to let all end users or only selected end
users install this particular file.) For information on completing the additional
fields that display when this option is selected, see Specifying Drop-Down
List Values for Substitution on page 341.
# Windows Installer Identifier
The installation author can enter text in the format of a Windows Installer
identifier to replace the default value. This text can contain ASCII
characters, digits, underscores, or periods, and must begin with either a
letter or an underscore. Example: Use this to allow a key to be changed or
entered into any table.
For information on the format types like the ones listed above, see Text Format
Types in the Windows Installer SDK Help.
# Bitfield (Drop-down List)
The installation author can select from a drop-down list to replace the
default value. This list displays only the name you gave the value, not the
actual value. This is useful when you provide values that are not self-
explanatory. Use the bitfield type only on columns that are bit flags.
(Example: In the Files table, the Attribute column contains bit flags
representing the file attributes. Therefore, you can use the bitfield type to
make a file’s attributes configurable. Possible choices for the installation
author could be for the file to be read-only; read-only and hidden; or read-
only, hidden, and vital.) For information on completing the additional fields
that display when this option is selected, see Specifying a Bitfield for
Substitution on page 341 and Bitfield Format Types in the Windows Installer
SDK Help.
# Integer
The installation author can enter any integer to replace the default value.
Example: Use this to make the size of a control or a dialog configurable. See
Integer Format Types in the Windows Installer SDK Help.
# Key Into a Table
The installation author can select a key into a table from a drop-down list to
replace the default value. (Example: Use this to let the installation author
change the directory for a component when adding a merge module to an
installation.) For information on completing the additional fields that display
when this option is selected, see Specifying a Key for Substitution on
page 342 and Key Format Types in the Windows Installer SDK Help.
• Non-nullable
Mark this if a value is required for this configuration item.
• Default Value
Enter the value that should appear on the Merge Module dialog when the
configurable merge module is added to an installation. This is the value that can
be changed.
3. Click OK.