[X4U] hidden files

[mactechlists at cox.net]

Does anyone know of an application that will let me see hidden files to 
make them visable? A friend deleted the .DS_Store file from a jump 
drive. It will no longer let him delete anything from the drive. We 
tried to put the .DS_Store file back, but we got an error message 
saying a hidden file by that name already exists.

We are unable to format the jump drive.
SE