Editing old dBase databases can be a tricky. Luckily, there are a number of inexpensive dBase (dbf) tools that can be downloaded from the Internet and used with TyTags DIY. These include DBFView and DBFmanager, but a quick search of Google should turn up plenty more.
Please note that it may be easier for you to use Microsoft Access databases or Microsoft Excel spreadsheets to store your data instead of dBase.
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