ASC files are typically found as ASCII files, hence text based. Should you need it you can rename them to TXT so they are associated by text editors by default. However it is not exactly needed as you could manually open them in any text editor regardless their actual extension.
Convert ASCII text to Text file.
We have found 4 software records in our database eligible for .asc to .text file format conversion.
Microsoft Windows software - convert asc to text on Windows
A sophisticated source code editor for programmers
Convert from asc file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned asc to text. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
One of the many text viewers and editors
An alternative text editor
On-line services software - convert asc to text on web
An online tool for generating ASCII number from text