CloneCD & IMG Files

[LRMMF]

Hi,
i'm getting crazy with this problem: - i've got big image files with .IMG extension, they're supposed to open with cloneCD but my cloneCD (newest version) doesn't open them, it only allows the opening of CCD files, so when i try to open IMG files with X00 MB's my PC crash.

So i don't know if it's supposed to have always two files (CCD/IMG) like in (CUE/BIN - though it's easy to extract or record from this last one).

I can see their contents in WinISO if i rename them as ISO instead of BIN.

What should i do? I have 5 images of 700 Mb each one from an encyclopedia to move out from the HD... can i record them as ISO or will i have problems like "no cd on cd-rom"