Our TREX is version 7.0.25. We installed it mainly to search documents on KM's repository(CM repository with FSDB mode). In System administration -> Monitoring -> KM -> Indexing Monitor, the status of my index is red and reports N errors. I found all the N errors are DOC, PPT, PDF and etc formats. The successfully indexed ones are all TXT files and folders and they could be correctly searched by TREX.
Do I have to specify the file formats for TREX to index? If yes, where?