.img files are normally floppy images. They mount just fine in VirtualBox.
How big is this .img file of yours? All the .img files I have are 720K or 1.5M in size. The 1.44M 3.5" floppies take 1.5M when you include the FATs, etc.
Here is an example of the command I ran on the host to create all the .img files I have working in VirtualBox:
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cat /dev/fd0 > ~/Desktop/dos330.img
I then found it much easier in VirtualBox to deal with .img files and virtually mount the floppy. I'm also glad I did it since my new computer purchased about 18 months ago doesn't have a floppy drive on it. Yet all my .img floppy images continue to work just fine in VB.