MonoDevelop does not open script.

new to unity here, im doing a udemy coarse on unity and came across this problem. When i double click my C# thumbnail in assets, MonoDevelop opens but not the script. i cant seem to find where it is saved either. (using win 8.1, ver4.6.3f1)

i also have this error in my unity:

Internal compiler error. See the console log for more information. output was:error CS2011: Unable to open response file: Temp/UnityTempFile-00fd9e5348366f64dbc21524a52cf623