Where do the MailStream Plus output reports write to?

MailStream Plus, all versions, all platforms
There are many output reports that MailStream Plus (MSP) can create.  Some are always created, some are optionally created using REPORT parameters.
The MailStream Plus Guide (formerly called the MailStream Plus Reference Guide) gives the location where each report outputs to by default.  Depending on the platform MSP is being used on, some of the reports can be redirected to a different output file of the user's choice.

Additionally, by default some of the reports go to one location when the width is not greater than 132 bytes, and for greater widths go to a separate output file that supports up to 256 bytes.

For more detailed information please refer to the MSP Guide mentioned above.
UPDATED:  November 16, 2017