There is only one file type that uses the .TMW extension:
Translation Memory Data File
Data file that contains linguistic and translation units for a translation memory used by Trados document translation software; continually grows and learns from the translator; can be opened directly with Trados Translator's Workbench.
A translation memory (TM) includes five file types including TMW files, as well as .IIX, .MDF, .MTF, and .MWF files.
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Updated: August 21, 2009