Read a text file from the bottom up

Hello all,

Needing help figuring out how to read a text file from the bottom up. I have the following code from http://stackoverflow.com/questions/10284786/powershell-search-backwards-from-end-of-file, which seems to work, but I wanted to make sure it's a good method, and also what the "..1" piece means:

$file = gc "C:\users\$env:username\Desktop\test.txt"

$file.Length..1

Is the above code a good way to reverse large text files?

What does the "..1" mean?