Macintosh Type 1 fonts are not recognized on Windows systems. It has nothing to do with the filename extension.
On the Macintosh, Type 1 fonts are stored in two parts, a bitmap font file containing a screen font plus font metrics (the metrics are the important part; nothing uses those bitmaps anymore) and an outline font file. The information of these files are stored in the "resource fork" of their respective files. Note that Windows does not have the concept of files having a "resource fork" and a "data fork" as used by MacOS.
Under Windows, Type 1 fonts are stored in two parts, a .PFB file containing the font outline and a .PFM file containing advanced font metrics.
There is no simple "converter" of one format to another. (The outline portion can be losslessly converted, but not necessarily the metrics portion. Furthermore, you may well be violating the license of the font by copying from system to system -- you need to check that issue first!)
The proper way to handle this is to license the Windows versions of the fonts used on the Macintosh.
By the way, this is why Adobe has been advocating use of OpenType fonts for the last eight years! The OpenType fonts are totally cross-platform compatible as opposed to the Type 1 fonts or Macintosh TrueType fonts.