[Nobody]

I'm trying to attach PDF files to email messages I'm sending in Apple Mail. When I attach them, some files end up being embedded as picture files instead of attached PDF's (and others don't).
These PDF's were exported as PDF's from Quark 6.5. I'm running Mac OSX (Tiger).
My co-workers report recieving images, not PDF's (jpegs, I think).
How do I get Mail to attach them as PDF's?

[MacGizmo]

Mail does not change a PDF to a .jpg, however it will show the first page of the PDF as an image in the mail... but only in OSX. But that doesn't "change" the file to an image, it just previews it.
Tell your co-workers to DOWNLOAD the attachments and open them with Acrobat rather than viewing them inline.

[BrunoP]

Also, and particularly if your coworkers use Windows, make sure that your files have the .pdf extension. Depending on how they try opening the file, it seems that Windows can get confused if it does not find the appropriate extension.

[Nobody]

Actually, I sent it to other Mac users. I'm on OSX, they're on OS9. Do you suppose this has something to do with it?

[dcpics]

As an experiment, make sure you attach by going through the menus saying Attach and then locate the file.
this is to make sure it is not simply dragged into the body of the e-mail where it may try to display it.
I have this happen a lot with photos. if you drag it into the body of the e-mail it will display the picture. Making sure it is simply attached it does not preview.

[BrunoP]

Have you tried to email the documents to yourself? This would help ruling out a problem with OS9.