Standard Test Interface Language (ATP) file is a Teradyne file format used by Teradyne testers. The .atp file is the main file that contains vector patterns, additional files can be supplied. 1) pin map file is an optional file and must have .pinmap file extension, 2) pin voltage or current levels is an optional file and must have the .level file extension), 3) timing set file, must be provided, this file should have .tset file extension. Since there is no standard way of specifying the additional files, The File import utility requires you to place all the files in the same folder, they must have the same file name as the main file (.atp). For example: if the main file is called scantest1.atp the timing set filename that has to be provided is called scantest1.tset, additional files scantest1.pinmap and scantest1.level can be also provided.