# Standard File and Directory Names

## Standard File Names

File Name | Location | Description
--- | --- | ---
`backgnd.gif backgnd.jpg` | directory | This file, if it exists, will be used as the background for the index in the current directory.
`frameset.htm` | directory | This is the frame set file for the directory in which it appears. This file is generated automatically for each subdirectory when frames support is enabled.
`hidden.dir` | directory | This file should be included in any subdirectory that should not appear in the index of the parent directory. The contents of this file is not significant, and it is usually a zero-length file.
`index.db` | start dir | This is the index database file for the entire directory tree.
`index.htm index.html` | directory | This is the index file for the directory in which it appears. This file will be displayed upon entry to a new subdirectory.
`keyicons.txt` | icons | When this KeyIcons file appears in the "icons" subdirectory, it is used to display icons next to each entry in an index based on the keyword list for that entry.
`keywords.kdb` | start dir | This is the keyword database file for the entire directory tree. Keyword databases have been replaced by index databases.
`nothumb.gif nothumb.jpg` | icons | This is the default thumbnail image file for all directories.
`symlinks.txt` | directory | This file is used to include symbolic links to other directories or files in the directory in which it appears.
`thumb.gif thumb.jpg` | directory | This is the thumbnail image file for the directory in which it appears. This image will appear as a link in the index of the parent directory, and under the index title in the index of the directory in which it appears. It should be small (recommended size: 100x66), and should contain a good representation of the directory contents.
`welcome.htm Welcome.html` | directory | Alternative names for "index.htm". These file names are recognized as index files when indexing subdirectories, but are not used to generate new index files.

See the The Icons Directory for standard icon file names.

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