Hi Sonia,
en-US-Custom.txt is the name of the custom dictionary which stores the words added by the users, when the spellchecker uses its default configuration.
I noticed that you set CustomDictionarySuffix="Custom" which will create a custom dictionary with name
en-USCustom.txt (without - slash between US and Custom). You can see how the
CustomDictionarySuffix property works in the following live demo:
Different Custom Dictionaries.
If you still experience any problems, open a support ticket and send a sample working project that demonstrates them.
Best regards,
Rumen
the Telerik team
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