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## Option panel : MIME Types

- MIME Types
An important new feature for some people. This panel tells the engine that if a link is encountered, with a specific type (.cgi, .asp, or .php3 for example), it MUST assume that this link has always the same MIME type, for example the "text/html" MIME type. This is VERY important to speed up many mirrors. Some big HTML files which have many links of unknown type embedded, such as ".asp", cause the engine to test all links, and this slows down the parser.
In this case, you can tell HTTrack: ".asp pages are in fact HTML pages"
This is possible, using:
File type: `asp` MIME identity: `text/html`
You can declare multiple definitions, or declare multiple types separed by ",", like in:
File type: `asp,php,php3` MIME identity: `text/html`
Most important MIME types are:

text/html | Html files, parsed by HTTrack
image/gif | GIF files
image/jpeg | Jpeg files
image/png | PNG files
application/x-zip | .zip files
application/x-mp3 | .mp3 files
application/x-foo | .foo files
application/octet-stream | Unknown files

You can rename files on a mirror. If you KNOW that all "dat" files are in fact "zip" files renamed into "dat", you can tell httrack:
File type: `dat` MIME identity: `application/x-zip`
You can also "name" a file type, with its original MIME type, if this type is not known by HTTrack. This will avoid a test when the link will be reached:
File type: `foo` MIME identity: `application/octet-stream`
In this case, HTTrack won't check the type, because it has learned that "foo" is a known type, or MIME type "application/octet-stream". Therefore, it will let untouched the "foo" type.

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