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The product information block identifies the product and channel this MAR file applies to. It also includes the new version number to avoid downgrades.
The product and channel are combined in the MARChannelName field.
PRODUCT INFORMATION BLOCK
4 bytes: Block size
4 bytes: Block identifier with a value of 1
<64 bytes: ApplicationID MARChannelName used to identify the product and channel (such as from MOZ_APP_IDMOZ_CHANNEL_NAME) Example: {ec8030f7mozilla-c20a-464f-9b0e-13a3a9e97384} 1 byte: null terminator <64 bytes: ChannelName (such as from MOZ_UPDATE_CHANNEL) Example: defaultcentral
1 byte: null terminator
<32 bytes: ProductVersion string (such as from MOZ_APP_VERSION) Examples: 12.0.1.5371, 12.0a1
