chooseviewer.py is a wrapper for deciding file type by its extension and calling the right application to view the file.
When called by BioLegato, the call to chooseviewer.py is almost always followed by a rm command to delete the temporary file. In many cases, the rm command seems to run before the application can read in the file, so we get a file not found error.

One hack that works is to just put a sleep 5 command between the chooseviewer call and the rm call.

We need to fix chooseviewer.py so that this problem can be solved in a more deterministic way.

Right now, when chooseviewer.py runs commands using Popen,
the p.wait() commands have been commented out. It might
be best to try uncommenting them and see if that fixes the
problem.