I followed the instructions on this page to install spell checking dictionaries.
If you have version 0.3 or later, you can use "Scripts -> Scripting TeXworks -> Show Scripts Folder" and navigate to the parent directory in the window that opens. (…) You should have a TeXworks resources directory in your "user profile" directory, typically C:\Documents and Settings\Your Name. This is automatically created the first time you run TeXworks, and some default resources are copied there. There should be a dictionaries subdirectory, but it is initially empty. Place the *.dic and *.aff files there, and then re-start TeXworks.
I let TeXworks open my scripts folder (which is C:\Users\Pieter\TeXworks\scripts), created a subdirectory called dictionaries and added the DIC/AFF files for en_US. After restarting TeXworks it still doesn't report any spell checking languages. What gives?
Best Answer
The dictionaries folder should not be placed within the scripts folder, but in the parent folder to this, i.e., the scripts and dictionaries folders should be on the same level. Hence, the path to the latter would be something like