What is a .BLEND1 file?
A .BLEND1 file is a special kind of backup file that is made by Blender, which is a program you can use for free to create 3D models. Think of it like a safety copy of your work. Whenever you save your project in Blender, the program automatically makes a .BLEND1 file. This file is basically a snapshot of your project from the last time you saved it. So, if you ever make a mistake or lose your current work, you can use the .BLEND1 file to go back to how things were before.
To use a .BLEND1 file, you just need to change its name. Replace ".blend1" at the end of the file name with ".blend", and then you can open it in Blender just like any other project file.
Blender is the main program you would use to open a .BLEND1 file. Since it's the software that creates these files, it's perfectly equipped to open and work with them.
Also, it's good to know that Blender doesn't just make a .BLEND1 file. Depending on your settings in Blender, it can make other files like ".blend2", ".blend3", and so on. Each of these is a backup of your project from different points in time, with ".blend1" being the most recent backup and the numbers getting bigger as the backups get older. So, if you have a .blend2 file, that's an even older version of your project than what's in the .blend1 file.
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