Have I told you that they're talking shit?
I know everything about them. Last year or so one of their princes, with his wife, were in Macedonia and from what i've been told, they've been treated like long lost brothers by the Macedonians.
The ancient Macedonian language (Alexander's) was not a written language, so apart from few words, we know nothing about that language. Those Pakistanis you talk about also speak a strange language so they're claiming that it's Alexander's language and they're descendants of Alexander's soldiers.
The latter might be true actually. On his way to India Alexander was picking soldiers on his way, so he probably did pick some soldiers from some places near India or Pakistan. He then colonized these soldiers in some strategical places.
So these Pakistani might be descendants of Alexander's soldiers, but they sure ain't descendants of Alexander and the ancient Macedonians. They look Pakistani/Indian and they lived isolated for all these centuries. It's obvious that their ancestors were also from the Indian peninsula.