Exported files format
EXP is a file extension for exported files. EXP stands for EXPorted files. EXP file extensions are commonly used for exporting standardized files to be used with other applications. Some of the more common applications that use EXP files are QuickBooks, Microsoft Visual C++ and several CAD software suites.
Learn more about .EXP files:
Learn about Exporting a PST at ITKnowledgeExchange.com.