DITA2Go uses a reference number to produce a jump from a cross reference. For interfile cross references to or from the help file you are producing, you must specify the names of all the topic files involved, in the form topicfile=helpfile; for example:
[HelpXrefFiles]
; file name in xref = file name for .hlp
chap1=chaphelp
You can specify a file extension for the destination help file; the default is hlp:
[Setup]
; FileSuffix = suffix to use (no leading dot)
; when converting [HelpXrefFiles] xrefs
FileSuffix=hlp
You can specify a name (without file extension) to use for any topic files not listed, as XrefFileDefault=helpfilename. You can use this setting for your own usual help-file name, so you do not have to name this file explicitly under [HelpXrefFiles]. For example:
[HelpOptions]
; XrefFileDefault = name of file to use for missing XrefFiles
XrefFileDefault = dita2go