EXFO FastReporter 2 - Manual (Page 267)

Working with iOLM files
Post Processing Software 257
Managing Bidirectional iOLM Files
5. Select the desired file naming options.

Select A->B filename or B->A filename to use the selected A->B
or B->A file name.

Select Identifiers to save the bidirectional file as per the matched
identifiers. The identifiers name is formed from the identifiers
order displayed in the Matched Files tab, separated by the
separating character you have selected.

Select Autonaming to enter a prefix and a suffix to create the file
name.