WHY CAN'T I OPEN OR SAVE MS OFFICE FILES TO AN EXT. HDD on my MacJuly 31, 2015Mac OSX Questions › Category: Mac OSX › WHY CAN'T I OPEN OR SAVE MS OFFICE FILES TO AN EXT. HDD on my Mac 0 Vote Up Vote Down DChung Staff asked 7 years ago I can open and save pdf’s images, etc but not word, excel, powerpoint files to an ext. HDD.I can copy the office docs to the local Mac HDD and it opens fine. So the files do not look corrupted.