The last comment is based on Feb 2 commit.

Now I tired Feb4 commit. It works well. No error message would be raised no
matter for local folder or local files.
Tramp will be triggered to be loaded when I try to open local files.

On Sun, Feb 4, 2018 at 10:52 PM, Shuguang Sun <shuguang@gmail.com> wrote:

> Thanks Michael.
>
> What to my supprise is not only the directory (.zip or .tar). The tramp
> should not be loaded for local folders or files. Is my understanding
> correct?
>
> Now I can open the folde with ext of .zip or .tar. It still trigers the
> load of tramp.
> And I try to open a local zip file. The file can be opened however it has
> the message "Error: (user-error "Package `tramp-archive' not supported")".
> Sorry not test it last time.
>
>
>
>
> On Wed, Jan 31, 2018 at 10:13 PM, Michael Albinus <michael.albinus@gmx.de>
> wrote:
>
>> Shuguang Sun <shuguang@gmail.com> writes:
>>
>> Hi Shuguang,
>>
>> > How to reproduce the bug:
>> > 1. create a Folder named "a.tar" or "a.zip" in local PC
>> > 2. load tramp
>> > 3. in dired, press Enter or dired-find-file on "a.tar" or "a.zip"
>> > 4. it reports: tramp-error: Package `tramp-archive' not supported
>>
>> Same here, under GNU/Linux. However, why do you create a directory ("a
>> folder") with the extension .tar or .zip? These are intended as "file"
>> name extensions, not for directories.
>>
>> Anyway, I've committed a patch to the master branch, which should fix
>> this. I hope this does not delay file archive operations too much,
>> because for every single magic file operation I have to check now,
>> whether the file archive is a directory.
>>
>> Could you pls check whether this works for you?
>>
>> > Best Regards,
>> > Shuguang Sun
>>
>> Best regards, Michael.
>>
>
>