Nature LibraryYour QuestionsTroubleshooting Quicktime for the Macintosh

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Some visitors have reported difficulty playing the digital movie clips which are available on this web site. This most frequently occurs because the QuickTime™ multimedia player is not installed on your computer or because the QuickTime™ plug-in was not placed in the browser's "Plug-ins" folder during installation.

If you do not have QuickTime™ installed on your computer, it will be necessary to download it. Upon installing QuickTime™, all the necessary components will be placed in the proper locations which in turn should allow you to experience the digital movies that comprise the Nature Library.

If QuickTime™ is installed on your computer but the movies are still not loading normally, please check to be sure that the QuickTime™ plug-in is correctly installed, as follows:


1. Select Edit > Preferences > from the menu bar

2. Then select Navigator > Applications > from the category list on the left.

3. Next, locate "Quicktime Movie" under the description column.

4. Make sure it is "handled by" the QuickTime plugin. If it is not, click on "Edit" and in "Description" type "Quicktime Movie", in "MIME Type" type "video/quicktime", and in "Suffixes" type "mov, qt". Under "Handled By" select "Plug-in" and select the QuickTime™ plugin you have installed on your computer.

5. If there is no Quicktime video listing under "Applications", click "New" and enter the info above. See this image of how it should look.


1. Select Edit > Preferences > Receiving Files > File Helpers. Sort by
"Extension" by clicking the word "Extension" and scroll down to ".mov".

2. If it is not there click "Add". The "Description" should be "QuickTime Movie". "Extension" should be ".mov". "MIME type" should be "video/quicktime". "File type" is "MooV". "File creator" is "TVOD". "Encoding" is "Binary" for incoming and outgoing. Finally, handling should be set for "View with plugin" and the QuickTime plugin should be selected from the list. If it is not in the list, it has not been installed! See this image of how it should look.


Browsers that support QuickTime™ are designed to recognize the plug-in and use it to play back the supported media types. Some multimedia plug-ins, however, can interfere with the normal auto-configuration of the plug-in and prevent it from being used.

If you have plug-ins other than the "QuickTime™ Plug-in" and the "Default Plug-in" installed in your browser's Plug-in folder and QuickTime™ is not working, then move these plug-ins to a temporary location and re-launch your browser. Conflicts resulting from plug-ins competing for control of the MIME types may be resolved by removing them.

If QuickTime™ is installed on your computer and the QuickTime™ plug-in "npqtplugin.dll" file is in the plug-in folder, but the movie is not loading or playing, there could be a conflict with another multimedia player installed on your computer. This is particularly true if a multimedia player was installed on your system after the QuickTime™ installation was performed. In this case, it is recommended that you reinstall QuickTime™.

Additional support resources

Apple Computer has developed a QuickTime™ support area that includes an "Installation Check" web page which can be used to check your QuickTime installation. These resources are available at the following URLs:

QuickTime Installation Check:

QuickTime Support:

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