Windows installer throws an error for unmodified MSI CAB

In MSI upgrade, if I don't include the unmodified MSI cab in the installset, windows installer throws this error during upgrade:

Error 1334. The file '{FILE}.{GUID}' cannot be installed because the file cannot be f开发者_运维知识库ound in cabinet file '{CABFILE}.cab'. This could indicate a network error, an error reading from the CD-ROM, or a problem with this package.

Note that, the specified cab in the error is NOT modified.

Correct. The Windows Installer will look for all the cabinets. Make sure the files are in the right cabinets and the order in the cabinets matches the Sequence column in the File table.