Importing tif and raw files simultaneously?

Anyone know why LR, will not import two files that have the sam name, with different extensions, such as tif and nef. If I put the two images into different folders, one for raw and one for tif LR recognizes both, but if they are in the same folder its a no go. Alternatively I can add an extended name to the tif or jpeg file and both all image will be imported.

Is there any way of getting around this? Other wise I will have to go through my entire collection of image creating different file names or putting edited tifs and jpegs into new folders different than the nefs.

Thanks in advance.

Rob