Learn about do files and view a list of programs that open them. An htm or html file is a hypertext markup language file learn how to open htm and html files or convert one to another file format like pdf etc. My credit card company uses the do extension on its estatements i have always been able to open them in the past but now when i try i get the message that this type of file cant be opened and do. Here is how to open command prompt in windows 10 8 7 vista and xp you have to open the command prompt in windows before executing a command
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