Questions about using dspack to play vob files

Questions about playing vob files with dspack: Delphi/Windows SDK/API
Http://www.delphi2007.net/DelphiMultimedia/html/delphi_20060925181523292.html
Experts:

How can I use dspack to play the vob files on the local hard disk?

I used dspack to play the vob file and filtergraph. renderfile (file name. vob), running in the debugging environment will report an error and cannot play back, but the generated EXE file can sometimes play back. Why?

In addition, if filtergraph. renderdvd is used, no error is reported, but a DVD disc is required.

Thank you!