Fix thumbnailer script

package/debian/mime/freecad-thumbnailer

@@ -1,11 +1,16 @@
 #!/usr/bin/python
 
-import sys, zipfile, md5
+import sys, zipfile
 import getopt
-import gnomevfs
+from urlparse import urlparse
+from urlparse import unquote
 
 opt,par = getopt.getopt(sys.argv[1:],'-s:')
-inpfile = gnomevfs.get_local_path_from_uri(par[0])
+uri = urlparse(par[0])
+if uri.scheme != "file":
+   sys.exit(1)
+   
+inpfile = unquote(uri.path)
 outfile = par[1]
 
 try: