Nul?

[MysteryGuest]

I have a strange little file called "nul" at the top level of my drive. No KB. Is it safe to delete it?

[spearmint]

null is zero.

[raz]

NULL may be zero, but NUL is the zero-th character in the ASCII character set.

It's likely safe to delete, but I'd ask
a) who owns it? if it's a user, then it's certainly safe to delete, and was likely the result of a bad installer
b) what does it matter? it's empty, and not taking up anything close to a significant amount of space. Heck, the browser cache file just grew more by your posting and reading the responses

[JEBB]

How about putting in the Trash and restarting to see if it makes any difference. Usually files in the trash are not usable but they are recoverable.