doc iconAscii extension stands for ASCII text file. Ascii file formats can be opened by Note Pad application.

ASCII extension is related to American Standard Code for Information Interchange. It is American character code system. There are 33 characters that can not be written and 95 characters that can be written in the Ascii system. 
For example: Enter key also corresponds to a character in this codes. Or bip voice on the computer also is a character. 

You may open text files that include ascii characters with Note Pad application.

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