ArasModules.vault.saveBlob() JS Function.

Does anyone know where the JavaScript function ArasModules.vault.saveBlob() is defined? It is called out in the saveContentToFile function in the client/javascript/ExportToOfficeHelper.js file.
The reason for the question is that the saveBlob() function is not preserving leading zeros from a table's outerHTML value when exporting the table to Excel.