Help with Blender Files (???)


I recently received a jump drive in the mail that supposedly has some secret/high priority stuff on it and some of these files are likely Blender files (extensions like .blend, .blend1) .

There are other files that I am not sure are Blender Files but look like they are probably 3d files that are most likely Bleder files. They appear to be created on a map because the backup versions of the files in the same folders with the same name start with a ‘.’.

Is Blender something I can download for free to view this stuff or is there someone here who can help me view it?