Files with the TAR.XZ extension belong to the archive file category. What do TAR.XZ files contain? The contents of files with the TAR.XZ extension are resources compressed using the LZMA2 algorithm.
Files with DEB extension contain Debian software packages used by Unix-based operating systems. Single DEB archive contains two TAR archives. First archive contains control information for the installer, while the second one holds the actual application installation files.
After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the TAR.XZ file after converting to DEB may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from TAR.XZ to DEB to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting TAR.XZ to DEB does not meet your expectations, you can simply try to find on the Internet a different version of your file in TAR.XZ format, properly converted to a DEB file by someone else. If this fails, use the information provided in the further part of the website.
Unfortunately, if after performing the two previously described steps (trying to find your TAR.XZ file converted by someone else, and the attempt to convert it to DEB on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the TAR.XZ file in its original format (without conversion to DEB file). Such a solution will be difficult to implement, but it certainly will give the best result.