Hi Douglas,
Oh I see what you mean... no, for CMOD the important thing is the index name, never the filename. The files are just a container of the data, and all the information needed to find the "uniquely" file is in fact in the metadata or Indexes.
You know the filename is irrelevant for archiving, it's just the name of the container. What is important for an archive is the metadata. And don't forget CMOD is not a DMS, where you track the files, where you can version it, where you work at the file level... then in that case, yes it is important. But CMOD is not like that.
So, if the filename is important for you, then you MUST add a new field in the metadata in order to keep it.
Something like:
...
GROUP_FIELD_NAME:filename
GROUP_FIELD_VALUE:my_important_filename.extension
...
GROUP_FILENAME:my_important_filename.extension
And it means, you should also have this field in your AG.
Hope that helps to understand the philosophy of CMOD.