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There are a couple of limits that you may hit when authoring a large, complex MSI package.
If your Windows Installer package contains more than 32767 files, you must change the schema of the database to increase the limit of the following columns: the Sequence column of the File table, the LastSequence column of the Media table, and the Sequence column of the Patch table. Note that transforms and patches cannot be created between two packages with different column types. This is explained in MSI Help topic Authoring a Large Package.
The maximum number of rows for the Component table is 65536.
This limit was discovered by Danish Waheed and posted on the WiX users mailing list. It has been confirmed by a Microsoft employee but hasn't been officially documented yet.
There is a maximum limit of 1600 components per feature using Windows NT/Windows 2000 and a maximum limit of 800 components per feature using Windows 95 and Windows 98. There will be a ICE47 validation warning if your package is above this limit. This is documented in MSI Help topic FeatureComponents Table.
There is a maximum limit of 16 for the depth of the feature tree. If you exeed this limit you get a runtime error message "2701. The Component table exceeds the acceptable tree depth of 16 levels." which is a bit misleading because the limit actually applyies to the Feature tree, not the Component tree (in my understanding there is no component tree in MSI). In a test with a feature tree 20 levels deep msiexec.exe even crashed instead of displaying an error message.
This limit has been reported by Danish Waheed on the WiX users mailing list. It doesn't seem to be officially documented.
For each disk or CAB file one row must be added to the Media table. Windows Installer packages are limited to a maximum of 80 Media table entries when installed using Windows Installer prior to version 2.0. The restriction of 80 Media table entries was removed with Windows Installer version 2.0. This is documented in MSI Help topic Media Table.
The only compressed file type supported natively by Windows Installer is the Cabinet (CAB) format. The following limits apply to this file format.
You can avoid these limits by splitting your setup into multiple CABs, possibly up to 64K * 2GB, or by placing your application files on the distribution disk uncompressed.
These limits have been documented on the Windows Installer Team Blog.
Windows Installer stores a lot of information about installed features and components in the registry. Because the size of a registry key is limited on Windows 9X, the following approximate limits apply:
These limitations are documented in MSI Help topic Windows Installer Registry Limitations on Windows 95/98/Me.
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