Acrobat ships with many CMap-like files. That is, they look like
CMap files, and even use CMap file syntax. They are not, however,
CMap files. This particular one maps 90pv-RKSJ-H code points
(Shift-JIS) to Unicode. In the third column, each four hex digits
represent a Unicode code point. Thus 90pv-RKSJ-H 0x8591 maps to
U+0030 plus U+002E.
How shall we know this? The file starts with
%!PS-Adobe-3.0 Resource-CMap
%%DocumentNeededResources: ProcSet (CIDInit)
%%DocumentNeededResources: CMap (90pv-RKSJ-UCS2C)
%%IncludeResource: ProcSet (CIDInit)
%%IncludeResource: CMap (90pv-RKSJ-UCS2C)
%%BeginResource: CMap (90pv-RKSJ-UCS2)
%%Title: (90pv-RKSJ-UCS2)
%%Version: 4.002
This makes it look like a valid CMap file.
Where can I get a list of cmap-like files specific to Acrobat?
To avoid future confusion, I strongly suggest to put a comment into
the pseudo-cmap file.
Werner