made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/keymap/README.txt

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+keymap files for Vim
+
+One of these files is loaded when the 'keymap' option is set.
+
+The name of the file consists of these parts:
+
+	{language}[-{layout}][_{encoding}].vim
+
+{language}	Name of the language (e.g., "hebrew", "greek")
+
+{layout}	Optional: name of the keyboard layout (e.g., "spanish",
+		"russian3").  When omitted the layout of the standard
+		US-english keyboard is assumed.
+
+{encoding}	Optional: character encoding for which this keymap works.
+		When omitted the "normal" encoding for the language is
+		assumed.
+		Use the value the 'encoding' option: lower case only, use '-'
+		instead of '_'.
+
+Each file starts with a header, naming the maintainer and the date when it was
+last changed.  If you find a problem in a keymap file, check if you have the
+most recent version.  If necessary, report a problem to the maintainer.
+
+The format of the keymap lines below "loadkeymap" is explained in the Vim help
+files, see ":help keymap-file-format".