I wont pretend to be an expert on the file system of Windows 98. But I will throw you a few possibile explanations.
Firstly, this may be a Windows file. But this seems unlikely to me. The name just doesn't seem right to me.
Secondly (and more likely I think), this file was something to do with the virus you removed. It may have been the file which was run at boot-up so that the virus was immediately active.
If this is the case then there will be a reference to it somewhere so that windows looks for it when you first switch on.
Try looking in the win.ini file and the system.ini files (use notepad) for a reference to this filename.
However, I would suggest not changing these very important system files until you are fairly sure you know what you are doing.
Have you tried looking on the internet for file names associated with this virus? This can sometimes help as the virus often uses the same file names time and time again.
Sorry I can not be more help.