At a customer SharePoint site the crawl log is full of this warning: “The file reached the maximum download limit. Check that the full text of the
document can be meaningfully crawled.”
This means that documents can not be crawled properly. SharePoint has a limit of 16MB. You can change this limit by doing this:
1. Start Registry Editor (Regedit.exe).
2. Locate the following key in the registry:
3. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\12.0\Search\Global\Gathering Manager
4. Open Edit - New - DWORD Value. Name it MaxDownloadSize.
5. Double-click, change the value to Decimal, and type the maximum size (in MB) for files that the gatherer downloads.
6. Restart the server.
7. Start Full Crawl.
Read more at the source.
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