My Librem laptop churning out DAT files?

Hardware
1

Sad state of affairs here. …
My librem laptop is either downloading all my files in DAT format , and/or sending in DAT

Tried sending files from librem laptop via email, my androld phone looking for me to enter a password to open the file… (tried entering the phone password to no avail.)

From my librem laptop,
Tried uploading a file, the website did not recognize the format.

I read that mozilla firefox is a way to send DAT files… ?

Have my files been hacked?
Maybe also my librem software?

Thanks to any brave souls who respond…

2

What kind of file are you actually trying to send? What created the file in the first place?

3

Hi
They are PDF files

4

And where did the PDF files come from? What created them?

5

Created by a tax website

Two days ago i downloaded similar files from the same exact site and emailed them as PDF
no problems whatsoever…

.

6

Maybe the PDFs got corrupted when you downloaded them the most recent time? I would try downloading them again

7

How big are the files?

What software are you using to email out the files? Firefox? Thunderbird? Something else?

Are we talking about WINMAIL.DAT or some other .DAT file?