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EstimateFileRiskLevel function

[This function is available on Windows XP with Service Pack 2 (SP2) through Windows Vista. It might be altered or unavailable in subsequent versions of Windows. Client applications instead should use IAttachmentExecute to present a user environment that provides safe download and exchange of files through email and messaging attachments.]

Estimates the risk of executing unknown code when a handler is called on a given file. This risk is based on an understanding of the handler and the code content of the file.

Syntax


HRESULT EstimateFileRiskLevel(
  _In_   LPCWSTR pszFilePath,
  _In_   LPCWSTR pszExt,
  _In_   LPCWSTR pszHandler,
  _Out_  FILE_RISK_LEVEL *pfrlEstimate
);

Parameters

pszFilePath [in]

Type: LPCWSTR

A pointer to a null-terminated string that contains the path of the file that is being checked against the handler.

pszExt [in]

Type: LPCWSTR

A pointer to a null-terminated string that contains the extension of the file that is being checked, either with or without its leading period. For instance, ".txt" or "txt".

pszHandler [in]

Type: LPCWSTR

A pointer to a null-terminated string that contains the path of the handler for the file.

pfrlEstimate [out]

Type: FILE_RISK_LEVEL*

When this function returns successfully, contains a pointer to one of the following values that state the estimated risk.

FRL_NO_OPINION (0)

The format of the file is not identified or the handler is not identified. Insufficient information available for a meaningful answer.

FRL_LOW (1)

The format of the file is completely understood, the handler is known, and there is high confidence that no extraneous code will be executed.

FRL_MODERATE (2)

The format of the file is identified, but it is not sufficiently understood to label as either a high or low risk.

FRL_HIGH (3)

The file format is understood and elevated risk factors have been identified.

FRL_BLOCK (4)

The file format is specifically blocked for this handler.

Return value

Type: HRESULT

If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

This function is not declared in a public header or included in a library file. To use it you must load it directly from Winshfhc.dll by ordinal 101.

Requirements

Minimum supported client

Windows XP with SP2 [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

DLL

Winshfhc.dll (version 5.1 or later)

 

 

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