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Thanks.

Hi, I don't know how to restore file type association in Windows to the default state with no associated program. In Control Panel -> All Control Panel Items -> Default Programs -> Set Associations: When Windows not know which app should open a dat file type, it assigns a blank default icon to this ...

I need to convert epub ebook into adobe pdf. Can you help?

I ran the Adobe Download Assistant and it placed a folder on my desktop with the following file: DesignStandard_version.7z.adadownload
I assume this is my trial DesignStandard installation, but Windows 7 does not know how to open this adadownload file. How do I install it?

Try some 3ga to mp3 or audio converter.
Look here: http://www.file-extensions.org/convert-3ga-to-mp3