What does HRESULT 0xC0AAB15D (IMAPI_E_MULTISESSION_NOT_SET) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: MultisessionInterfaces must be assigned before the filesystem import method is called.

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IMAPI_E_NO_COMPATIBLE_MULTISESSION_TYPE	IMAPI_E_IMPORT_TYPE_COLLISION_DIRECTORY_EXISTS_AS_FILE

IMAPI_E_MULTISESSION_NOT_SET

IMAPI_E_MULTISESSION_NOT_SET is a direct setup-order error in IFileSystemImage. Microsoft explicitly requires put_MultisessionInterfaces before ImportFileSystem. The interfaces describe how the current optical media exposes previous-session state.

Set session information before importing the filesystem

Obtain the multisession interfaces from the configured data-format object for the current disc.
Assign them to the same IFileSystemImage instance that will perform the import.
Only then call ImportFileSystem or a specific import method.

Retrying import without setting the property repeats the same failure. This is not evidence that the disc lacks a supported filesystem. Keep setup-order diagnostics separate from import-result diagnostics: first prove that the current media interfaces were assigned, then interpret filesystem-not-found, compatibility or read errors returned by the actual import.

ImportFileSystem · Set multisession interfaces · Creating a multisession disc

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