Webtrends Analytics 9 Adminstration Guide, November 2012
Webtrends Express Analysis provides constantly updatable reporting based on SmartSource Data Collector files. To provide these quick updates, Express Analysis analyzes copies of your SmartSource files located on the same computer as the Express Analysis Engine.
As new log data becomes available, it is copied to the Express Analysis source directory. The Express Analysis Engine processes it into a new file format with a .prt extension, which provides the data for Express Analysis reports. The original copied log file data is deleted as soon as Webtrends converts it to .prt format.
Webtrends Installation Directory\modules\prtmover\wtprtmover.ini