You will most likely encounter this string in the following places:
Simplified the way developers wrote multi-threaded and asynchronous code, making apps faster on multi-core processors. net-framework-4-0-v-30319-32
Are you trying to or configure a web server using this version? You will most likely encounter this string in
Allowed developers to create "pluggable" applications more easily. net-framework-4-0-v-30319-32