不是这么少,按照
http://developerland.com/DotNet/Enterprise/340.aspx
的介绍,参看文章的“Which files is Indexing Server capable of indexing?”这个部分
* query.dll - Filters files with the TXT, ASM, BAT, C, CPP, CXX, CMD, DEF, DIC, H, HPP and XML extensions. These are all read as plain text files.
* nlhtml.dll - Filters files with the ASCX, ASP, ASPX, CSS, HHC, HTA, HTM, HTML, HHT, HTW, HTX, ODC and STM extension. These are all files which contain or render HTML content.
* offfile.dll - Filters files with the DOC, DOT, POT, PPS, PPT, XLB, XLC, XLS and XLT extension. All these files are MS Office files.
* mimefilt.dll - Filters files with EML extension, which are MIME content.
* mspfilt.dll - Filters files with the TIFF extension. This filter gets installed by MS Office 2003.