You can actually disable it for TextMate, although it's not completely clear to me if this disables it just for unsupported or all filesystems.

https://manual.macromates.com/en/saving_files#extended_attributes_metadata

Also this might be relevant:

https://manual.macromates.com/en/expert_preferences#oakdocumentcustomfsmetadata

K.

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On Sep 25 2017, at 1:52 pm, Martin Kühl <martin.kuehl@gmail.com> wrote: 
On 25 September 2017 at 12:45,  <dangerwillrobinsondanger@gmail.com> wrote:
> I don’t think there are apps that should be using resource forks any more. That’s really a Carbon and pre-Carbon thing.

TextMate is using extended attributes, which were introduced in 10.4
(I think) and which are also stored in doubles on filesystems that
don't support them natively.

-Martin

>> On Sep 25, 2017, at 19:17, Etienne Samson <samson.etienne@gmail.com> wrote:
>>
>> I think the the technical term is "AppleDouble" files.
>>
>> https://en.wikipedia.org/wiki/AppleSingle_and_AppleDouble_formats
>>
>> They get created anywhere the underlying filesystem doesn't provide resource forks, or extended attributes (which is mostly anything not HFS+). Since TextMate uses those extended attributes to stash some relevant (like the cursor location), this causes them to appear more frequently.
>>
>> If you're using git, you should definitely setup a global exclude file with a few of those macOS-specific patterns. See https://www.gitignore.io/ for some helpful ones.
>>
>> Another way would be to edit your project on an HFS+ drive* — you'll get those pesky .DS_Store anyway, but at least the ._ files shouldn't appear.
>> * I'm only suspecting you do, since AppleDouble files are unneeded on HFS+.
>>
>> Regards,
>> Etienne Samson
>> --
>> samson.etienne@gmail.com
>>
>>> Le 25 sept. 2017 à 05:39, Greg <socalmtnbiker@gmail.com> a écrit :
>>>
>>> Matt
>>>
>>> Thanks for the response. I never noticed these files before. Are they created by TextMate, because I don’t see them anywhere else. Or are they created when load the thumb drive on the Windows machine? From the linked discussion in another response I gather it’s TextMate storing some other information, but they don’t always seem to be created. Does TextMate need them or use them? I ask because maybe I don’t want to delete them.
>>>
>>> I see them also using Transmit (an ftp app).
>>>
>>> Greg
>>>
>>>
>>>> On Sep 24, 2017, at 5:00 AM, textmate-request@lists.macromates.com wrote:
>>>>
>>>> This is not a TextMate question. It's just how Macs work. Those are resource forks, which Windows can't comprehend. See for example https://superuser.com/questions/851373/hide-macs-dot-underscore-files-on-a-windows-share-in-a-mixed-user-environm
>>>>
>>>> m.
>>>>
>>>>> On Sep 23, 2017, at 9:48 AM, Greg <web@web.knobby.ws> wrote:
>>>>>
>>>>> Is TextMate adding files with a leading period and underscore in front, for example, ?._styles.css"?
>>>>>
>>>>> I?m using TextMate for a class that mostly Windows and all these extra files show up when I?m on Windows as well as other apps which show invisible files. This doubles the apparent number of files.
>>>
>>>
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