There is only one file type that uses the .TTD extension:
Tinytag Explorer Data File
A TTD file is a data file created by Tinytag Explorer, a Windows program used to manage and present data recorded by Tinytag data loggers. It contains data recorded from a Tinytag data logger, which may include indoor and outdoor temperatures, humidity, carbon dioxide levels, and cool storage pressure. TTD files are primarily used to share data with other Tinytag Explorer users.
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Updated: September 23, 2017