This variable defines a series of directories to be searched for data files. This process is described in detail in the User's Guide section 2.7.2 . The value "." is the default.
You can specify a directory path that contains embedded spaces if you surround the path with quotation marks. For example:
FILE_PREFIX C:\"Sales Data"
Remote name notation is allowed for the FILE_PREFIX variable if your runtime is client-enabled (for indexed files, remote name notation requires the Vision file system). See User's Guide sections 5.2.1 and 5.2.2 for more information about client-enabled runtimes and remote name notation.
Up to 4096 characters can be specified for the value of this variable.