Gmail advanced search with has:attachment syntax

Any idea why when I sometimes search within my gmail account (via a browser), and I include the syntax "has:attachment", I still get search results which do not have attachments.  Sometimes it returns only emails with attachments but other times it returns results which have no attachments.
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u587162Asked:
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Gerwin Jansen, EE MVETopic Advisor Commented:
Check those messages that have 'no attachment', do they have pictures in the message? That is where I'm getting hits on has;attachment as well.
u587162Author Commented:
I have checked and not all of them have images that I can see.  not sure if they are invisible ones, you know those tiny gif signatures etc.
Gerwin Jansen, EE MVETopic Advisor Commented:
I opened one that had no attachment but a picture in it. Right-click and I could save as if it were an attachment. Apparently detected by Gmail as attachment.
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u587162Author Commented:
ok how would I run the search to find attachment but exclude images?
Gerwin Jansen, EE MVETopic Advisor Commented:
Adding a size is working for me:

has:attachment larger:500k
u587162Author Commented:
Problem with that is that you will miss out on the essential attachments you are trying to search i.e. Word or Excel docs which might be below that size limit.
Gerwin Jansen, EE MVETopic Advisor Commented:
Yes however, Word or Excel typically will show as an attachment. Just a flaw in the has:attachments I'm afraid.
u587162Author Commented:
Sorry for the delay in replying.  Is there a syntax to then exclude certain file attachments from the search?
Gerwin Jansen, EE MVETopic Advisor Commented:
The Advanced Search syntax is documented here:
https://support.google.com/mail/answer/7190?hl=en

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