why would it work any better with powershell? I mean, cool if you did, but I just can't see how powershell has more knowledge than windows shell?

anyways, tiff utils (http://www.remotesensing.org/libtiff/)
should have a solution for this, but it is file by file...
win32 binaries are available from http://gnuwin32.sourceforge.net/packages/tiff.htm

and the util you would be interested is tiffinfo.exe
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