Something that is named platexrelease.sty

platexrelease.sty

% platexrelease.sty
\NeedsTeXFormat{pLaTeX2e}
\ProvidesPackage{platexrelease}[2015/05/07 v0.1]
%
\edef\platexreleaseversion{2015/01/01}
\RequirePackageWithOptions{latexrelease}
\ifx\requestedLaTeXdate\@undefined
\PackageWarningNoLine{platexrelease}{%
Package 'latexrelease' not found}%
\expandafter\endinput\fi
\ifx\latexreleaseversion\platexreleaseversion\else
\PackageWarningNoLine{platexrelease}{%
Version mismatch between 'latexrelease'\MessageBreak
and 'platexrelease'}%
\expandafter\endinput\fi

%--------------------------------------- \eminnershape

\IncludeInRelease{2015/01/01}{\eminnershape}{\eminnershape}%
\DeclareRobustCommand\em{%
  \@nomath\em
  \ifdim\fontdimen\@ne\font>\z@
    \mcfamily\eminnershape
  \else
    \gtfamily\itshape
  \fi}
\def\eminnershape{\upshape}
\EndIncludeInRelease
\IncludeInRelease{0000/00/00}{\eminnershape}{\eminnershape}%
\DeclareRobustCommand\em{%
  \@nomath\em
  \ifdim\fontdimen\@ne\font>\z@
    \mcfamily\upshape
  \else
    \gtfamily\itshape
  \fi}
\let\eminnershape\@undefined
\EndIncludeInRelease

%--------------------------------------- Extended Allocation

\IncludeInRelease{2015/01/01}{\e@alloc@chardef}{Extended Allocation}%
\ifx\omathchar\@undefined\else % FAM256 patched
  \ifx\enablecjktoken\@undefined % pTeX
    \omathchardef\e@alloc@top=65535
    \let\e@alloc@chardef\omathchardef
  \else                          % upTeX
    \chardef\e@alloc@top=65535
    \let\e@alloc@chardef\chardef
  \fi
\fi
\EndIncludeInRelease
\IncludeInRelease{0000/00/00}{\e@alloc@chardef}{Extended Allocation}%
\let\e@alloc@top\@undefined
\let\e@alloc@chardef\@undefined
\EndIncludeInRelease

\IncludeInRelease{2015/01/01}{\e@mathgroup@top}{Extended Allocation}%
\ifx\omathchar\@undefined\else % FAM256 patched
  \mathchardef\e@mathgroup@top=256
\fi
\EndIncludeInRelease
\IncludeInRelease{0000/00/00}{\e@mathgroup@top}{Extended Allocation}%
\let\e@mathgroup@top\@undefined
\EndIncludeInRelease

%--------------------------------------- all done
\endinput
%% EOF