An old Microsoft Word file extension, as it is from before 27th June 2013, as it is not used anymore, it can be converted with Office Online.
Hope this helps
.DOCT file extension
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1. English language only please
2. No spam, advertisement or inappropriate material
3. No trolling and flaming
Re: .DOCT file extension
Ah thank you, found references for that on internet and added you file type entry. http://www.file-extensions.org/doct-file-extension