i am guessing that win is defaulting to " help" for a non Microsoft format and tring to use the 15 year old "MS zip" on the r-click menu
garbing a page at ran.
http://wms.lroc.asu.edu/lroc/view_lroc/LRO....0/M107694274LE-- top left of page--
the EDR
/2009258/NAC/M107694274LE.IMG
the CDR
/2009258/NAC/M107694274LC.IMG
the Tiff
/2009258/M107694274LC_pyr.tif
the top 2 are in PDS .img format , 16 bit
NASAView will open then save it as a 8 bit indexed gif
photoshop should be able to open the tiff
( i do not own a copy of MS adobe Photoshop )
i open them in isis3 ( there is a " almost/sort-of" working microsoft version
i think it is text only -- no GUI , you need to type
also Imagemagick can open the IMG's with some help there is a text header before the image starts in the file
any hex editor ( including MS Visual Studio ) can read the beginning of the img file and you can use the header size there in the ( yes TEXT only) IM program "convert"