If you were looking for a word document with the .doc extension, you would do something like this:
1. At the DOS prompt, type dir /s /p *.doc
This will search your computer for all file with the doc extension.
/s = displays files in current directory and all sub directories
/p = pauses after each screen of information
* = wildcard, searches for all files regardless of the name.(before the .)
From the list of files, you should be able to see your file.
Right down the full path to you file.
2. Using my example, you need to copy the file to your disk drive.copy c:\docs\resume.doc a:\
Here's a link to a website with DOS command help.http://www.computerhope.com/msdos.htm
Every scenario is a little different.
Hope that helps.