Recovery Toolbox for Outlook Express features an easy way of open dbx file, supporting any version of Outlook Express email client. This tool converts not accessible files with dbx extension into clean folders that can be used by Outlook Express
Try to open a file with exclusive access. This can be very useful in a bat-file if you want to process a specific file that may be opened in another program (word for example). WaitForFile will block until it is able to open the specified file.
File Type Mechanic is useful tool that will find the solution when you get 'Windows can't open this file' error message. The program will scan and find wrongly configured or missing file type and program associations.