can't overwrite the file

we use the real server at work and i'm wondering if anyone knows how to fix this ANNOYING problem...

if someone's viewing a file on the realserver, we cannot delete the file or overwrite the file.

this really sucks because we'd prefer to just overwrite the same file so that we don't have to update our links.

any thoughts or suggestions, reader(s)? (i don't want comments that are obvious, like stop using real!)