People using Mac OS 8 & 9 occasionally have the the problem of their downlded files being blank documents that the Mac operating system doesn't recognise. This can be due to long file names or the file's attributes have been stripped. The ways to fix these issues can be seen from the following 2 links (which also may link onto other possible solutions.) Click on the following links:

1. How do I open blank "limewire document"

2. cannot open anything