[REQUEST] Corrupt attachment when drag and drop into Outlook

[TAPtech]

So this one is a pickle. Just installed Windows 10 Pro on a client's system. Downloaded Office 2016 through O365. Setup Outlook.

When dragging and dropping files into an email, the attachment is immediately corrupt. An 8MB file turns into a 200byte file. File name looks fine. This happens before the email is even sent- if you save the email as a draft and open it up in the drafts folder, the file is tiny there as well. Some files seem to be fine, so far .STL filetypes seem to be almost all corrupted.

If you instead click the attachments button and browse to the file, it works fine.

Steps taken so far:
-Uninstall Office, reboot, reinstall.
-Create new Outlook profile
-Create new user profile
-sfc /scannow

Very odd issue. There's really no software installed on the system except for Solidworks, which does have some explorer hooks. Anyone seen anything like this before?

 

[Mainstay]

Remove all add-ons in Outlook.

If you rename it to something like .jpg... send it to yourself, change the extension back... does it work?

Is the user signed into O365?

(a/v is off for testing purposes).

 

[TAPtech]

Remove all add-ons in Outlook.

If you rename it to something like .jpg... send it to yourself, change the extension back... does it work?

Is the user signed into O365?

(a/v is off for testing purposes).

Forgot to mention, disabled all COM add-ons and tried safe mode as well.
Changing the file extension worked. Will try removing the windows 3d viewer app thingy.

 

[TAPtech]

So I started putting too much time in this and decided to just wipe/reload. Installed Office... same problem. I've tried setting it up with a different user on a different domain as well to test. Same problem. Rename the file.stl to file.jpg and the problem goes away. There must be some native Windows handling of .STL files that is mangling this. I'm surprised I haven't seen it until now.

 

[Mainstay]

just compress them all before sending... maybe not ZIP, but some other compression format may work.

 

[TAPtech]

That works and so does using the Attach Files button instead of drag and drop. It doesn't really solve the problem or reveal the mystery though!

 

[Mainstay]

no it doesn't, unfortunately. I did some googling on this issue and it does seem like you are not alone. Being sure the user is "signed in to MS" seemed to be a common solution, but I don't see how that can affect the price of beans in China. I also do not see how an STL file could somehow trigger this behavior.

Sorry - no help from me on this one.

 

[TAPtech]

Hehe, I appreciate your input nonetheless. This machine seems to have been having some odd problems prior to the wipe/reload anyhow, so we may just replace it.