When I try to add symbol, i see this:
How can I add new symbol to existing ascii dataset?
PS: Sorry for my English.
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Symbols can't be added to an ASCII DataSet this way. The "Add..." command is only used to request data from online data vendor (or SQL server etc.) that supports data collection. This is why it's disabled for WL4Files and ASCII DataSets. Hope you get the picture.
To add symbols, manually copy a CSV/TXT file into the folder where the data is stored using a file manager.
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