Error Message: Could not read this files because the plugin could not recognise the file

It wont let me open a file I saved yesterday? What does this error message mean & how do I fix it?

WHich version, which system?
What's in the file?
Where is the file saved?
Have you already tried:
- a restart
- re-creating the prefs file?

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    Message was edited by: Portale Sardegna

  • Every time I launch Firefox it pops up an error stating "Firefox could not install this item because "install.rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem."

    Firefox could not install this item because "install.rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.
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    OK, my starting point is that LR can happily contain 400000+ photos, and it's a mistake to create a 1 star plus catalogue as you suggest. Instead, I'd recommend you create a master catalogue of all your photos, which you can then query however you want - 2 star, or a certain keyword, or with "xyz" in the title etc.
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    Oh, dear.
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  • Lightroom could not import this catalog because of an unknown error.

    OS 10.5.8
    (gb mem
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    Permissions are open to everyone on the folder the Catalog is in.
    When I try and import the catalog in lightroom I can see the thumbnails, 
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    I'm having this issue as well, and honestly I've *never* been able to get "import from catalog" to work. In my case I have a catalog created on my Windows 7 laptop in LR3.5. I've copied it to an external drive, plugged it into my PC running Windows 7 with LR3.5. And I get the "could not import this catalog because of an unknown error" message.
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  • I keep getting the error:  "lightroom could not import this catalog because of an unknown error" when trying to import from a catalog?

    I have around 400,000 photos of 15 years so given the high number, I organized all my photos into 6 catalogs to avoid potential problems. All the photos and the catalogs are in a 4TB Seagate external hard drive. I use Adobe Lightroom 5 and I use a PC with the latest Windows Office 2013.
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    I then tried exporting the needed photos to a new Catalog and that worked.  But then when I try to import them again from my Master *+ Catalog I get the same error again!!
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    This is a duplicate thread - see here

  • Help I need help. i get this message'Firefox could not install this item because "install.rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.' How do i fix this?

    Firefox could not install this item because "install.rdf" (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.
    Well that is the message i get. I can still use firefox(version3.6.8)

    You get that error if an extension is using an old and no longer supported method to install a plugin.
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