I knew many restricted and special characters in file and folder names that impossible to use, or they can cause trouble later.
For example putting a dot at the end of the name will cause it to disappear.
Explorer itself has more restrictions, for example a dot at the beginning of filename is very hard to put.
OK, but what's wrong with at-sign
I didn't saw anywhere any restrictions about it, nor could I find it now.
1) Open Windows Explorer and create a file or folder with name
2) Press F2 and rename it to
3) See? New name was cancelled.
My question is: WHY?
I tested this "feature" on XP, Win7 and Win10.
Funny thing in WinXP is that renaming
@0,0 actually renames it to
Looks like this is internal Explorer behavior, because in CMD console it is perfectly fine to do