Dominoes in my text files

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http://forums.fedoraforum.org – There are dominoes (rectangles with circles) in my text files that I created, revised and saved using gedit and leafpad. The dominoes replace some of the dashes in my text files - but not all of the dashes. Are they embedded web bugs or rootkits? I have been manually removing them but this is time consuming. Anyway to quickly scan for dominoes inside of text files? Though I never save my text files as encoded, some of them become encoded. I open them, copy my text into a new text file and delete the encoded text. Sometimes, the new text file becomes encoded. How to prevent these executables? (HowTos)