Vbp1.7z.001 Site

: You need every related segment (e.g., vbp1.7z.002 , vbp1.7z.003 , etc.) in the same folder.

To see what is inside, you generally cannot open just this single file. You must follow these steps:

Do you have the (002, 003, etc.) in the same folder? How to Extract .7z.001 files - Microsoft Q&A

: It can refer to "Visual Basic Project" files, though these are typically single .vbp files rather than large split archives.