Is there software that can be installed on a Mac that plays Quicktime files (not Quicktime)?

My boss has a Mac and we cant install Quicktime coz he has forgotten his password for the system and cant uninstall the trial version of Quicktime. Is there software that can be installed on a Mac that plays Quicktime files (not Quicktime)?
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Why not just reset the system password:

He is going to have to do that eventually anyway or he won't be able to update a lot of software.
Do you mean MPEG4 files? Try VLC for Mac:
The QuickTime Player application is not a trial application.  It will never expire.  It should play any QuickTime file with which  the codecs are current.  There is a thing called QuickTime Pro which just unlocks many less-needed features after paying for a keycode. (These are marked with "PRO" in the menus when not paid.)

If you have a QuickTime file it can't play, try updating the system with Software Update in the System Preferences under the Apple menu (top left.)

There are other QuickTime-playing applications.  Look for them on or Google.

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