Attachments sent from a Mac
Sometimes when you are sent a file which was created on a Mac which you cannot view it with the relevant tool on unix. This is because the file is of type "BinHex" and needs to be converted into a file unix can read.
Consider a file with this problem called IMApaper.ps which you cannot view with ghostview. To un-binhex this file, rename it to IMApaper.ps.hex and then run the unhex command on IMApaper.ps.hex ie
mv IMApaper.ps IMApaper.ps.hex unhex IMApaper.ps.hex
This will result in a file called IMApaper.ps being created which ghostview can read.
Do the same for files with different extensions eg renaming file.tex to file.tex.hex etc