Thank you vitamin and Dan Kegel. Here's what I had to do to get this working from within Infocentral. I created the run_prog as per the code from vitamin. I made it executable. I added a key to [HKEY_CLASSES_ROOT\.xls] with data as "xcelfile" I added the key [HKEY_CLASSES_ROOT\xcelfile\Shell\Open\command] /usr/bin/run_prog /usr/bin/oocalc "%1" Note that the command is slightly different from that posted by vitamin. I don't know why, but it works. Now when I click on an excel file in Infocentral, oocalc opens the spreadsheet correctly. - I didn't need the /bin/sh - I did need to fully qualify the run_prog path. - I didn't need the \"%1\", I just needed "%1" This has also solved my spaces in path names issue - the "" I suppose. Now I need to create entries for .doc files etc. Thank you very much for your excellent help and speed of reply. Best wishes Hilary
