uncompressing .sitx with unstuff

[brownh@hartford-hwp.com (Haines Brown)]

I received a .sitx file and need to uncompress it. The only thing I
found to do it is a 15-day trial proprietary utility named unstuff by
Stuffit.  

When I use it, I get:

$ <path>unstuff <path>file.sitx
yo::fork exception: cannot open "file.sitx"; 2 No such file or
directory. 

I don't know what to make of this error statement. 

Is there a non-proprietary way to decompress .sitx files?

-- 
 
       Haines Brown
       KB1GRM