A file with the VBK file extension is likely a proprietary VitalSource BookShelf VitalBook e-book file. Though the e-book program does not provide an conversion capabilities, you can convert the VBK file to a Portable Document Format (PDF) file by first installing a PDF print driver. To install a PDF print driver, install a PDF creation application, such as Adobe Acrobat. Alternatively, use one of the free PDF creation programs, such as doPDF or CutePDF, which also install a virtual PDF printer to the computer. Once the PDF driver is installed, the virtual PDF printer becomes an option in the "Printers" selection box.
Open the VBK file in the VitalBook program.
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Click the "File" option on the top task bar, and then click the "Print" option.
Click the "Printer Name" drop-down box in the Printer dialog box, and then click the "PDF Printer" option from the drop-down list. The wording for the PDF Printer may vary in the list, depending on which software installed the virtual print driver.
Type a name for the new PDF file into the "File Name" input box.
Click the "Save" button. The VBK e-book is converted and saved by printing the file to the PDF format.