Adobe Acrobat Reader running under Firefox gives an error, saying "the file doesn't begin with %PDF" or similar.
Do you have an alternative format or file?
TIA.
73, Bill
That's a download issue, not a file or format issue.
Your file didn't d/l correctly. Try doing a save-as to the desktop or somewhere else, then open it directly instead of trying to get the browser to pass the file to the 3rd party app.
Hope it helps.
Shane