From: r9jmg0@yahoo.com   
      
   On 26/02/15 05:53 AM, J. P. Gilliver wrote:   
   > As I type (e. g. in this compose window in Thunderbird, or in a webform   
   > - but not, I've just checked, in Notepad!), words mis-spelt are   
   > underlined in wiggly red; I presume this is something built-in to   
   > Windows 10.   
      
   No, it's not. indows 10 does not have a comprehensive, built-in   
   dictionary app for looking up word definitions, though it includes a   
   spell-check dictionary for autocorrect.   
      
   > Right-clicking on such a word brings up a menu, including suggestions   
   > and also Add To Dictionary.   
   >   
   > I've always been wary of such, in case I add something that was just a   
   > genuine mistype, as I don't know where the dictionary is nor how to edit   
   > it. Anyone know?   
      
   The dictionary that's responsible for the wiggly red underlining is the   
   spell-check dictionary that's built into Thunderbird.   
      
   > (I've just discovered that right-clicking on the word after adding - as   
   > I just did with "webform" above - provides an Undo Add To Dictionary   
   > option. But of course that will only work straight after the adding, not   
   > much later, as for example might happen when you added a genuine   
   > mis-spelling you thought was right and only much later discover wasn't.)   
      
   Google's Gemini says the following:   
   ____________________________________________________________________________   
   To edit your personal dictionary in Thunderbird, open a new message   
   "Write" window, click "Spelling," and select "Edit" in the personal   
   dictionary area to remove or add words.  Alternatively, close   
   Thunderbird, locate the persdict.dat file in your profile folder (Help >   
   More Troubleshooting Information > Open Folder), and edit it directly   
   with a text editor.   
      
   Methods to Edit Your Dictionary   
      
   - Via the Compose Window (Easiest):   
   1. Click Write to start a new email.   
   2. Click the Spelling button in the toolbar (or right-click a word and   
   select check spelling).   
   3. In the dialogue box, click Edit under the "Personal Dictionary" area.   
   4. You can then remove words or add new ones to your user dictionary.   
      
   - Via the Profile Folder (Direct Edit):   
   1. Close Thunderbird entirely.   
   2. Go to the menu (≡) > Help > More Troubleshooting Information.   
   3. Under "Application Basics," click Open Folder (or "Show in Finder" on   
   macOS).   
   4. Locate the file named persdict.dat.   
   5. Open this file with a text editor (like Notepad or TextEdit) to add,   
   remove, or edit words manually.   
      
   -Adding New Languages:   
   If you need to change the dictionary language itself, navigate to   
   Settings > Composition > Spelling to select or install new language   
   dictionaries.   
      
   - Important Notes   
   1. You can only directly edit your personal dictionary, not the main   
   application dictionary.   
   2. Ensure Thunderbird is closed before editing persdict.dat directly to   
   avoid file corruption.   
      
   HTH.   
   --   
   John C. I filter crossposts, various trolls & dizum.com. Doing this   
   makes this newsgroup easier to read & more on-topic. Take back the tech   
   companies from India & industry from China.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)