QT Player 7.4.5 won't open old .mov files

I'm trying to open old (i'm pretty sure they were in animation compression from 2004, probably OS9) .mov files. The message says: The movie could not be opened. The file is not a movie file. Please help!
Thank you!

Try VLC or MPEG Streamclip as a start, both are free.

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Opening a .mov file on a Mac across a Windows network causes hang

QuickTime player hangs when I try to open a .mov file on a networked Mac OSX machine from my Windows XP machine. This happens 80-90% of the time; that is, not every time, but most of the time.
I've tried this from 2-3 different machines, and get the same result.
Interesting thing is that, if I'm viewing the directory that the .mov file comes from in Windows Explorer, Windows Explorer also hangs - so it looks like something bad in going on in the Windows networking layer.
File opens fine when I open it locally or on another Windows machine on the network.
We're actually accessing the QT SDK from an app we're developing. We first noticed this behavior in our app, and decided to see if we could repro the problem in QT player. Sure enough, we could.
Is there somewhere else I can log this message so that it will come to the attention of the SDK group? This a major problem for our app that I need to resolve one way or another.

A MOV. file can be anything.
I would suggest you download and install Perian from http://perian.org/
You should read this support page http://perian.org/#support in case you need to delete older codecs.

I'm running snow leopard. The try to open any .mov file in Quicktime, and I get an error message that says, "The document xyz.mov could not be opened. The movie is not in a format that Quicktime player understands. I'm a recent upgrade to Snow Leopard.

I'm running snow leopard. The try to open any .mov file in Quicktime, and I get an error message that says, "The document xyz.mov could not be opened. The movie is not in a format that Quicktime player understands. I'm a recent upgrade to Snow Leopard.
Help!
Thanks, Mark

Unfortunately, the error message gives no details about what codec might be missing or what it needs.
If the file can't be opened in QT, it only means you cannot use the QT "Inspector" window to check what compression formats were used to create the file. It does not mean you can't use the Finder "Information" window to check on the compression formats or use a third party media information window (e.g., like VLC which will open many compression formats not supported natively by QT) to determine what kind of data is included in the MOV wrapper. If the file cannot be opened in any app, it is usually a good sign that the file itself is corrupted.
It's a stupid error message. Apple should do better than that.
Error trapping is quite extensive but there are still many areas which require human oversight. The message is telling you that either the container has a problem (e.g., not properly terminated, non-standard, or corrupted) or that one or more of the compression formats used is not supported by your current codec component configuration or that the data was encoded using non-standard settings or preferences not supported by QT or that the fourCC code does not match the data contained in the file or that there are timecode inconsistencies, etc., etc., etc. In short there are a near infinite number of possible problems for which it would be very difficult/nearly impossible to program error trapping depending on your sourcing of content and how you process it before it reaches the player app. Think of it like trying to play a BD disc in an DVD player.
I'll call Apple support when I get a chance.
Chances are good that they will end up sending you back here. In any case, it is often a good idea to post a sample file for examination by other QT users. At the very least, they should be able to tell you if the sample file will play on other systems which would indicate whether or not the file itself is bad and under the best of circumstances whould allow them to examing the file in detail for various common problems.

Quicktime for Windows -- on Vista -- opens a .mov movie once, then won't open the move and Quicktime won't even open itself. I've installed the latest version, and upgraded it to Plus as well.

I am having trouble opening .mov videos with Quicktime on my PC with Vista. I installed the latest version of Quicktime for Windows (V.7.7), and upgraded it to Pro. It will open a .mov file once, then after that it will not open any .mov file and in fact, when I try to open the Quicktime player it will not open itself. If I switch users to Admin, it all works fine, but when I go back to my regular role (where all of my preferences and programs are there for me to use), the same thing happens. An .mov file will open once, then never again, and the Quicktime player seems to be disabled.
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QT Player 7.4.5 won't open old .mov files

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