Exactly I don't get it what you are trying to do. I mean you wanted to disable the attachment or you want only one format of attachments should traverse over email.
Anyways here are some explanations are there regarding Content Type and Attachments in the Filename statement. I hope the below information will help you.
xt' | ATTACH= ('filename.ext'attachment-options)
specifies the physical name of the file or files to be attached to the message and any options to modify attachment specifications. The physical name is the name that is recognized by the operating environment. Enclose the physical name in quotation marks. To attach more than one file, enclose the group of files in parentheses, enclose each file in quotation marks, and separate each with a space. Here are examples:
specifies the content type for the attached file. You must enclose the value in quotation marks. If you do not specify a content type, SAS tries to determine the correct content type based on the filename. For example, if you do not specify a content type, a filename ofhome.htmlis sent with a content type of text/html.
CT= and TYPE=
If SAS cannot determine a content type based on the filename and extension, the default value is text/plain.
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