Autocorrect.txt file feature

[llestat]

All - I was toying with the idea of using the autocorrect feature to create short cut txt entries on the fly. Similar to shortcuts on palm os where you enter a sequence of characters and the txt then gets replaced with your defined string. for example I enter ".kk " in a message and it gets replaced by "Knock Knock ". I modified the autocorrect.txt file by adding the entry mentioned earlier but nothing. The other items still work ( (c) gets replaced by the copyright symbol) but my entry does not. So the question is as follows;
Is this the correct file to modify?
If not is there a way to modify the correct file/database to add this feature?

Trust me this is a much faster method of entering quick txt than having to click and select from a list of the "My Text" entries.

Thank You - Richard