Lilyofthevalley1.7z.001 -

There are usually subsequent parts like LilyoftheValley1.7z.002 , 003 , and so on. How to Extract LilyoftheValley1

Right-click only on the file ending in .001 and select "Extract Here" or "Extract to folder..." . LilyoftheValley1.7z.001

You need a specialized tool like 7-Zip or WinRAR . There are usually subsequent parts like LilyoftheValley1