It will most likely be Document1, as in the example below. If it hadn't been saved at all prior to the software crashing it will be DocumentX (X being the sequential number Word automatically assigns to unsaved documents).
Click the Go menu, and click on Go to Folder. If this does not occur, continue with the following steps. If the software determines that everything is functioning properly upon quitting, it will DELETE THE AUTO-SAVE. IMPORTANT: You can only recover unsaved work if it is the result of a CRASH.
If you've lost an unsaved Microsoft Word document due to a software crash, you can locate the most recent auto-save of your document by following these steps.