Image Capture Nikon D200 EXEC file

Use Image Capture 6.6 to download from my Nikon D200 to my MacPro with Yosemite 10.10.4. For some reason, my camera has decided to create an EXEC file so that when I try and download my photos using Image Capture the EXEC file puts Image Capture into a forever spinning search mode and I’ve got to restart my Mac to get out of it. I successfully download my photos using Photoshop Bridge and then delete the EXEC file, but have no idea where or why or how it’s being created. Just a recent problem...and not all the time. Tried some quick random photos in the house and they opened with IC without a hitch. Even shot random photos over 2 days and they also opened in IC. But just returned from Chicago having taken photos over a 2 week period and once again the mysterious EXEC file was created. Wrote Nikon and naturally they said it was a problem with my software. [Nikon's response: D200 wouldn't create EXEC files, it may be the software you are using to import your pictures is placing that file as an index for the metadata or something, so it's not related to D200 please contact the software company.] Don't see how IC could create an EXEC file since it appears to freeze trying to read that file? Would sincerely appreciate and ideas/suggestions!