The gnutar file extension is related to GNU Tar archives. Gnutar files are often compressed with Gzip into .tgz files. This file type is obsolete and no longer actively used.
The gnutar format was defined by the Free Software Foundation. It is compatible with Mac OS and Windows. Five programs can open gnutar files like WinZip and Apple Archive Utility.
Gnutar files fall under the Data Files category with 1,326 similar file types. The gnutar format was developed by the Free Software Foundation.
When double-clicked, Windows looks at the gnutar file extension. If it does not recognize the extension, it asks you to select an app to open the file. This means Windows does not have a default program set to open gnutar files.