any time you see a file with a filename  that starts with 
~$Filename.ext  the ~$ it means that it is a temporary file that is used 
by the word (or other) program to keep track of things untill the program is 
closed.  things that allow you to delete and restore  information. 
when you delete it the old version is stored in the temp file. that is 
how you can restore mistakes. so if you are working on a file 
named FirstFile.doc while you are working on it their is a temp file 
called ~$rstFile.doc in the same folder as the the firstfile.doc. when 
you save and exit the Firstfile.doc the ~$rstfile.doc will disapear.   

Try this create a file with a paragraph or two in it and save it to your 
desktop without closing it. , minimize the file without closing it. and 
you will see the two files on the desktop. the main file Filename.ext
and the temp file ~$lename.ext. right click the taskbar on 
the main file while it is minimized in the taskbar. then close the 
main file you will see the temp file close also.
MN