The .tmpl file extension is most commonly associated with the Xfire software application. Xfire allows users to track, message and interact with online gaming friends. The TMPL files contain the interface template files that customize the look and feel of the Xfire interface.
The .tmpl file extension is also used for SWISH-E example files.
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If you have additional information about the TMPL file format or software that uses files with the TMPL suffix, please do get in touch - we would love hearing from you.