In MikTex 2.8, after updating, there is a problem running latexdiff.
When running latexdiff.exe at the command line, it responds:
latexdiff: the Perl script could not be found
latexdiff: Data: latexdiff
Running just the following DOES work fine:
perl "C:\Program Files (x86)\MiKTeX 2.8\scripts\latexdiff\latexdiff"
Apparently, latexdiff.exe is not (re)created when initexmf --mklinks is used (credit to Ulrike Fischer, see this long comment thread at http://tex.stackexchange.com/questions/95699/latexdiff-problem-in-miktex-2-8-after-update-perl-script-not-found#comment206004_95699)
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