Where is the startup folder ( win10 preview)

Info and suggestion already provided :

 

Just right click on the windows button, you have the option.

Lievre

 

Or at the Run dialog:

Code:

 %ProgramData%\Microsoft\Windows\Start Menu\Programs\StartUp

 

Did you try to run the task elevated but in user context, not system one:

Code:

SCHTASKS /CREATE /TN "3p4" /TR "%userprofile%\Desktop\tpc-0.44-rc2\bin\Windows-amd64\3p4.bat" /SC ONLOGON /RU "" /RL Highest /F

 

Indeed:

Code:

--------------------------------------------------------------------------------

SYSTEM VARIABLES
--------------------------------------------------------------------------------

SYSTEM:
%systemdrive%        > C:
%homedrive%          > C:
%windir%             > C:\Windows
%systemroot%         > C:\Windows
%programfiles%       > C:\Program Files
%programfiles(x86)%  > C:\Program Files (x86)
%commonprogramfiles% > C:\Program Files\Common Files
%programdata%        > C:\ProgramData
%allusersprofile%    > C:\ProgramData
USER:
%userprofile%        > C:\Users\s1ave77
%homepath%           > \Users\s1ave77
%appdata%            > C:\Users\s1ave77\AppData\Roaming
%localappdata%       > C:\Users\s1ave77\AppData\Local
%public%             > C:\Users\Public

--------------------------------------------------------------------------------

BTW: Ancient expression %homepath% needs %homedrive% in front to be a path (i.e. %homedrive%%homepath%) .