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Just pass needed folder as 1st parameter of the command line:

my.bat:

"C:\Program Files\LibRaw\FastRawViewer\FastRawViewer.exe" C:\Users\Pictures\MyNewPhotos

wife.bat:

"C:\Program Files\LibRaw\FastRawViewer\FastRawViewer.exe" C:\Users\Pictures\WifeNewPhotos

If folder path contains spaces, do not forget to quote path

"C:\Program Files\LibRaw\FastRawViewer\FastRawViewer.exe" "C:\Users\lexa\My Best Pictures\2014"