Robert you have to locate where on your pc Dreamfall places your saves. If the save sent to you is zipped then you must unzip it first.
Many games require saves to be named in sequential order for the game to recognize them. The dreamfall save format file naming is (dreamfall_09.sav) You simply rename your donated save file changing only the number to whatever the next number would be in the order in your save folder. copy and paste the renamed file into the game save file.
They could be anywhere Dreamfall saves used the file extension of .sav Try doing a search In win 7 click on the start button bottom left of your desktop. Fill in search box with .sav it should locate them for you.