The MSICompressionType parameter determines whether to compress MSI files for package distribution.

Compression improves performance when opening MSI files and using the ThinApp SDK.

If you create an MSI file during the capture process, ThinApp adds the MSICompressionType parameter to the Package.ini file and sets the initial value of Fast to compress the file. Decompression occurs at the time of installation.

You do not have to set the MSICompressionType parameter to Fast when you set the CompressionType parameter to Fast. Setting both parameters does not increase the amount of compression.

Preventing MSI File Compression

If you are working with large builds and performance is not a priority, you can modify the MSICompressionType parameter to prevent MSI file compression.