does not start with %PDF

I have a few readers of our newsletter that get an error when opening my PDF documents:

"the doc could not be opened because it does not start with %PDF"

They have version 4 installed.

Other PDFs open just fine. What could be wrong? It opens fine on my machines.

TIA
DoughBoy
DoughBoyAsked:
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tskelly082598Connect With a Mentor Commented:
When that message is received upon opening a PDF file is sent as an attachment to an e-mail message, the following suggestions to fix the problem from Adobe may help:

http://www.adobe.com/support/techdocs/7cc6.htm

Please advise if this works for you or not.
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weedCommented:
Have you opened the PDF with a data fork editor? Does it actually start with %pdf?
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DoughBoyAuthor Commented:
What is a dark fork editor?
The name of the file contains all standard characters with .PDF as the extension.
It opens on my machine fine. It is the customer who has the problem, and the customer has a full Adobe Tool set. I just have the reader.
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weedCommented:
Mac files generally have Data forks and Resource forks. PC files just have data forks. Data forks contain the text etc in a file. Usually the raw data. You want to be able to read that data.
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