IDXNAMETYPE only affects the data file for Vision files.
The name of the index file (if present) is derived from that of the data file. For example, if the data file name presented to the File Handler is abc.def, the options shown above give the following data and index filenames:
|0||abc.def and abc.idx|
|1||abc.def and abc.def.idx|
|2||abc.def.dat and abc.def.idx|
If the data file name is abc and FILESUFFIX=dat, the following data and index filenames are given for IDXNAMETYPE=3:
|3||abc.dat and abc.idx|