Can't Open .png Fiies

I have just upgraded to a new iMac and have transferred all my files, settings & applications from my old iMac. The old machine had MAC OS X 10.4.11 and the new machine has 10.5.5
Everything went perfectly except I can't now open .png files in Photoshop CS2 version 9.0.2. I get the following error message, "....Photoshop does not recognise this type of file"
Has anyone had the same problem?

I have just realised the I now only have 4 Plug-Ins listed under "About Plug-In" in Photoshop but on my old machine there must be about 100 listed. How do I transfer all of these?
Thanks

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You may ask Photoshop questions in that forum Photoshop General Discussion
The Cloud forum is not about using individual programs
The Cloud forum is about the Cloud as a delivery & install process
If you will start at the Forums Index https://forums.adobe.com/welcome
You will be able to select a forum for the specific Adobe product(s) you use
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nickymc wrote:
> i have a set PNGs that won't open. when i try to open
them, either from the
> desktop or through the file menu, i get an error saying
"can't open file, an
> internal error occurred."
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Linda Rathgeber [PVII] **Adobe Community Expert-Fireworks**
http://www.projectseven.com
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On Tue, 23 Jan 2007 16:34:15 +0300, nickymc
<[email protected]>
wrote:
> I can't reopen some PNGs that had not previously given
me any problems.
>
> At the same time, I seem to be having a corrupt font
problem that's
> affecting
> Safari and Mail. Now, I am conjectruing that the same
font problem is
> keeping
> these PNGs from opening. Are there any workarounds that
will save me the
> time
> of rebuilding these files?
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My OS is 10.4.11. on 2 GHz Intel iMac.
I reread my orignial post and noticed a typo. I can save png's with PS "save for the web," but can't open those just-saved png files.
I did lots of things before I noticed that the png wasn't working. Don't know which may have caused a problem. Likely things? Well, I added a plugin for Ico. format. I deleted it because I thought it might have caused the conflict.
Assuming that was the problem, what can I do to restore the png file format?
I don't have disk warrior. I did run the maintenance utility yesterday. It runs crons, clears caches, deletes cookies, that kind of stuff.
I've never had a problem with it disabling plugins or causing any problems. Haven't run disk utility for a few weeks. Would that help?
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Can't Open .png Fiies

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