Srt file problem in DVD Flick

When I try to add an srt file, DVD Flick tells me the file name is invalid.

But when I try to rename the file, by right clicking it in Windows Explorer, the only choices on the menu are Open and Send To.
I also can’t copy the file to another folder.

I tried to find a way to rename the file in VLC Media Player but couldn’t.

The file name is very long and has two sets of open and closed brackets and one dot. I’m guessing these may be illegal characters, but really have no idea why i can’t rename it or why it’s invalid to DVD Flick.

I’m running XP Home SP2.

And I’m new to all this.

Any help will be most appreciated. Thank you.