I do not recall this error in previous Emacs versions.

2016-11-26 21:57 GMT+01:00 Márton Marczell <dalokmarcinak@gmail.com>:

> In both cases it says:
> #("C:\\Users\\Márton\\AppData\\Roaming" 0 31 (charset windows-1250))
>
> I configured the file association through the Windows 10 GUI interface as
> follows:
> 1. Doubleclick file with a currently unknown extension.
> 2. File association dialog comes up. Click "More apps"
> 3. Scroll down and click "Look for another app on this PC"
> 4. File open dialog comes up. Browse for "runemacs.exe" and double-click
> it.
> When I look at the "Command Line" column for the currently running program
> in Task Manager, it simply shows
>
> "D:\Program Files (x86)\emacs\bin\emacs.exe"
>
> with no arguments other than the filename.
>
> What's worse, it seems completely random whether the error comes up. For
> some files it doesn't appear, for some files it does. But if I open the
> same file repeatedly it always does the same thing. So for a certain file
> it is consistent. It is not dependent on the file extension though.
>
> 2016-11-26 21:26 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:
>
>> > Date: Sat, 26 Nov 2016 21:19:01 +0200
>> > From: Eli Zaretskii <eliz@gnu.org>
>> > Cc: 25038@debbugs.gnu.org
>> >
>> > What do these display:
>> >
>> >   M-: (user-login-name) RET
>> >   M-: (user-real-login-name) RET
>> >
>> > Please try this both in the session started by clicking a file
>> > associated with Emacs and in a session started from the command-line.
>>
>> And please also do the same with
>>
>>   M-: (getenv "HOME") RET
>>
>> Also, please show the command that is configured in the file
>> association to invoke Emacs when that file is clicked.
>>
>> Finally, did this ever work with any previous Emacs version, and with
>> a non-ASCII user name?
>>
>
>