Considering .asp files are viewable using any text editor, you may as well simply rename the extension from asp to txt to easily view the content. If you just want text out of the visualized form (without tags), you will need to use some sort browser to view .asp file first before you copy the content.
Convert ASP text document to Text file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert asp to text on Windows
A sophisticated source code editor for programmers
Convert from asp file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.