No, these are excel spreadsheets that include VBA and java script.
Sure, these spreadsheets are open and the code is not password protected. You can use these spreadsheets and extend the code if you wish.
The spreadsheets are fairly straight forward, many come with built-in help messages. If you experience any difficulty with a corrupt file let us know. If you require consultation services, you will need to contact DerSoft for a block time quote.
Feedback is always welcome. We try our best to produce a great product for a fair price so let us know how we are doing.