FINAL CONCLUSION
1.if you put <FILENAME>.mb <or ma >.jpg or iff or rgb or tif or tiff to directory : mydocumentsmayafile images
than you can see this preview images to FILENAME.MB or MA
2. IFF file PREVIEW added. (but first of all you have to register iff file extension to fcheck.exe as a default opener)
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2 NEWS
1. IFF file preview avaible 
2. now you can put preview image file formats notonly for jpeg.
also you can put rla iff tif tiff and iff format to /file images directory
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just create a folder to my documentsmayafile images
and put images to it. file format must be : [MAYAFILENAME].mb.jpg
so if you put images to it you will see MB or MA file format's thumbnail referring to these images
