OverWriteFile

Defines what happens when a file in the installation set already exists on the user's system. This command is used when no entry is made in the File command.

Your options include:

Option
Description
No
Leaves existing files intact.
Ask
Asks the user whether to overwrite existing files.
New
Overwrites if the existing file is older (based on time/date stamp) than the file in the installation set. If the file is a .vbs, .dll, exe, or .ocx file, the age is based on the internal version number instead of the time/date stamp.
Yes
Overwrites files.