While trying to resolve a much uglier and more complicated problem, I have discovered that ModelDoc2::ForceReleaseLocks​ and its companion method ModelDoc2::ReloadOrReplace​ do not properly manage the temporary lock (tilde) files associated with the model.  Consider the following simple C# macro:

public void Main()
        {
            ModelDoc2 mDoc = (ModelDoc2)swApp.ActiveDoc;
            int retval = mDoc.ForceReleaseLocks();
            if (retval == 1)
            {
                string dirName = Path.GetDirectoryName(mDoc.GetPathName());
                string fileName = Path.GetFileName(mDoc.GetPathName());
                string newFileName = dirName + Path.DirectorySeparatorChar + "A" + fileName;
                File.Move(mDoc.GetPathName(), newFileName);
                retval = mDoc.ReloadOrReplace(false, newFileName, true);
            }
        }

This code simply releases the locks on an open part file, renames the file by prepending it with 'A' and then reloads the new model.  What I have found is that the tilde file for the original part file is never deleted.  For instance, if I open a file named A.sldprt, a tilde file is created named ~\$A.sldprt.  After the macro is run, there are now two tilde files: ~\$A.sldprt and ~\$AA.sldprt.  This rogue tilde file will persist even after closing all documents and even after closing SW itself.  With a name like ForceReleaseLocks, you would think that deleting the lock file would be one of its primary functions.