Problem opening tif Files

Have a dual boot Win. ME (Fat 32)and Win. XP Pro. (NTFS)Like to use Arc Soft
Photo Studio 2000 on ME to edit my photos, but when I drag & drop a tif photo
from XP to Me, Photo Studio won't open it. Tells me "this format invalid or
unsupported." Get the same message if I put the tif on a floppy and move it
to ME.
Photo Studio works perfect if I scan tif directly to ME. Works ok if I
e-mail the tif from XP to Me.

Can any one tell me what's going wrong, why won't a tif thats ok on XP move
to ME and work?

Linusverl