Add,subtract and edit spellcheckers in windows

This is for Firefox users

To manually edit, merge, transfer and otherwise manipulate Firefox 2's built-in spell-check dictionary.The secret sauce is the plain text file named

Code:

persdict.dat

in your Firefox profile directory.

In Windows 10 computers using Firefox.

Click on the search (magnifying Glass) in the Taskbar
type in the following:

persdict.dat

This will open a plain text editor with words in it.
probably WordPad , Or open NotePad if you have to and do a save as to persdict.dat.

BUT! That you don't want to do till you have followed theses steps.
open persdict.dat file if you cant find it (you should be able to from search)
when you open persdict.dat it should be filled with either nothing or a few words.
copy and paste into a fresh document.

I personally changed the order (Sort A to Z ) of the words in MS Excel. by doing a copy and then open Excel and do a paste.
Then in Excel do a sort. Then do a select all and copy.
Open your MSWord or Wordpad and do a paste.

Now delete the original spelling list and the paste into it (the custom dictionary) .

Just type in new words or edit or delete then save when finished
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In Windows MSOffice
Open Word and Add or edit words in a spell check dictionary

Excel for Office 365 Word for Office 365 Outlook for Office 365 More...

Important: Adding a word to a custom dictionary in one Office program makes that word available for spelling checks in all Office programs.
Windows, macOS, Web
All custom dictionaries are managed through the Custom Dictionaries dialog box, and any custom dictionaries you want to use must be enabled (selected) in this dialog box. Follow these steps to open the dialog box, and then choose a specific task below.
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Open the Custom Dictionaries dialog box

• Open the proofing options:
  
  
  
  • In most Office programs: Go to File > Options > Proofing.
    
  • In Outlook: Go to File > Options > Mail > Spelling and Autocorrect > Proofing.
    
  
  
  
• Make sure the Suggest from main dictionary only check box is cleared.
  
• Select Custom Dictionaries.
  All dictionaries are listed here, with the default dictionary at the top.
  

Add, edit, or delete words in a custom dictionary

Note: To quickly add a word to a dictionary, right click the word in a document, and select Add to dictionary. The word is added to your default dictionary.

• Open the Custom Dictionaries dialog box by following the steps in the Open the Custom Dictionaries dialog box section, above.
  
• Select the dictionary that you want to edit. Make sure you don’t clear the check box.
  
• Select Edit Word List.
  
• Do one of the following:
  
  
  
  • To add a word, type it in the Word(s) box, and then click Add.
    
  • To delete a word, select it in the Dictionary box, and then click Delete.
    
  • To edit a word, delete it, and then add it with the spelling you want.
    
  • To remove all words, click Delete all.
    
  
  [You must be registered and logged in to see this image.]
  

If you want this custom dictionary to be the default dictionary, where any new words you add will be saved, see Change the custom dictionary to which the spelling checker adds words below.
Select the headings below for more information

Add words to the default custom dictionary while checking spelling

If the spell checker flags certain words as misspelled but you want it to ignore these words, you can add them to the default custom dictionary. To change the default custom dictionary where these words are added, see "Change the custom dictionary to which the spelling checker adds words."

• When checking spelling and grammar automatically, right-click the word with the red squiggly line, and then click Add to Dictionary.
  
• When running the spelling and grammar checking tool, click Add or Add to Dictionary for the flagged word.
  

Note: If the Add to Dictionary option is not available, make sure you have a default custom dictionary selected in the Custom Dictionaries dialog box. See Change the custom dictionary to which the spelling checker adds words to learn how to select a default custom dictionary.
To learn more, see Check spelling and grammar.

Create a new custom dictionary

• Open the Custom Dictionaries dialog box by following the steps in the Open the Custom Dictionaries dialog box section, above.
  
• Select New.
  
• In the File name box, type a name for the custom dictionary.
  
• Select Save.
  
• If you want the new dictionary to be used for another language, while the new dictionary is still selected in the Dictionary List, select the language on the Dictionary language menu.
  

If you want your new custom dictionary to be the default dictionary, where any words you add will be saved, see the next task, Change the custom dictionary to which the spelling checker adds words.

Change the custom dictionary to which the spelling checker adds words

When you add words while checking spelling, new words are added to the default custom dictionary, which is the one at the top of the list when you open the Custom Dictionaries dialog box. You can change the default custom dictionary used for all Office programs:

• Open the Custom Dictionaries dialog box by following the steps in the Open the Custom Dictionaries dialog box section, above.
  
• In the Dictionary list box, do one of the following:
  
  
  
  • To change the default dictionary for all languages, click the dictionary name under All Languages.
    
  • To change the default dictionary for a particular language, click the dictionary name under the language heading.
    
  
  
  
• Select Change Default.
  Note: If there is only one dictionary under a heading, it must be the default dictionary. In this case, the button isn’t available.
  

The next time that you check spelling, the program uses the default custom dictionaries that you selected.

Change the language associated with a custom dictionary

Add a third-party custom dictionary


The Custom Dictionaries dialog box lists the available custom dictionaries the program can use to check spelling. If the dictionary you want to use, such as one purchased from a third-party company, is installed on your computer but not listed in the Dictionary list box, you can add it.

• Open the Custom Dictionaries dialog box by following the steps in the Open the Custom Dictionaries dialog box section, above.
  
• Select Add.
  
• Locate the folder containing the custom dictionary you want, and then double-click the dictionary file.
  

If you want this custom dictionary to be the default dictionary, where any new words you add will be saved, see Change the custom dictionary to which the spelling checker adds words above.

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NOTE:
I am always on the lookout for words like Wheres and Heres  etc. that it ignores.
The correct spelling should be   --- Where's and Here's.
You can do this in both spell checkers when you are posting on a forum.