.R3T File

The r3t file extension is related to the RealText, a solution used to create timed text presentations that can stream alone or in combination with other media such as audio or video.

Using RealText, you can add subtitles to a video, for example, or provide closed-captioning.

Mime types:
text/vnd.rn-realtext3d

This r3t file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

How to open:

Probably viewable in RealPlayer.

How to convert:

There is probably no real way how you can convert this particular file type to anything else.