This is "Named BOM" file that is generated as "Save as" option of Bill of Materials tab. To see this file first choose "Show Bills of Materials" from Display menu and go to folder that given in report.
Was able to see BOM files with the "show Bills of Materials" option.
However can not see the 1.BOM files.
The files we found were diffenert file names from the ones we are trying to locate.
The file extension is .1.BOM on the files we are trying to locate,