Help needed with lost folder

I renamed a folder with the file extension: .onetwothree in attempts to hide it from my desktop and search bar. Only problem is...I seriously can not locate the folder any more. Is there anything I can do to locate it now?

Thanks in advance for any help

 

Anybody? If this is in the wrong section, I appologize. I could REALLY use some help with this though.

 

Thanks so much for your help. Unfortunately, I still can not locate the folder. I tried the first method, but couldn't find the file. Before renaming, I moved the file to my desktop. Option 1 allowed me to see all the hidden files (they were kinda dimmer than regular files), so I know it worked. Just couldn't locate what I was looking for. Is it possible I did something wrong?

Option 2, I know I moved it to the desktop, and I believe I know the name of the folder (I know I know some of the sub folder names). This was all before I renamed it of course. So my question is, how would I rename it if I can't find it?

Option 3; when I ran "find" I got a lot of "permission denied"...is that normal? I also tried "locate", but got nowhere.