File (package block map schema)

Article
05/14/2021

Represents a file contained in the package.

Element hierarchy

<BlockMap>: <File>

Syntax

<File Name    = The name of the file must be non-empty and no more than 260 (MAX_PATH) characters supported by the APPX package format (even though ZIP format supports up to 65535 bytes).
      Size    = nonNegativeInteger
      LfhSize = The size of the Local File Header for a file must be at least 30 bytes and no more than 64KB as required by the ZIP format. >

  <!-- Child elements -->
  Block*

</File>

Key

* optional (zero or more)

Attributes and Elements

Attributes

Attribute	Description	Data type	Required
LfhSize	Size, in bytes, of the file's Local File Header (LFH) structure in the package. For more info about file headers, see ZIP file format specification .	The size of the Local File Header for a file must be at least 30 bytes and no more than 64KB as required by the ZIP format.	Yes
Name	Root path and file name.	The name of the file must be non-empty and no more than 260 (MAX_PATH) characters supported by the APPX package format (even though ZIP format supports up to 65535 bytes).	Yes
Size	Size, in bytes, of the file's uncompressed data.	nonNegativeInteger	Yes

Child Elements

Child Element	Description
Block	Represents a block of binary data contained in a file.

Parent Elements

Parent Element	Description
BlockMap	Defines the root element of the app package block map. The BlockMap element specifies the algorithm that is used to compute cryptographic hashes and contains a sequence of File child elements that are associated with each file that is stored in the package.

Remarks

The order of the Block child elements must correspond to the order of the data blocks as they appear in the file being represented.

Requirements

	Value
Namespace	`http://schemas.microsoft.com/appx/2010/blockmap`

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