[softwarelist] OPW - referencing pictures and drive path changes

The ability to reference pictures in OP/OPW documents is an extremely useful feature, but problems arise when the location of the picture file "changes".
My OPW documents and associated picture files are kept on external USB drives, which are connected to a MacBook Pro running Windows XP under emulation (previously the drives were connected to a WinXP PC). For reasons I don't fully understand, Windows will occasionally decide to change the "letter" assigned to an external drive (F: > G:, for example). When that happens, OPW can no longer find the pictures for a particular document ... and if <pictures> happens to be ticked in View>Options (and there is a picture on page 1 of the document) then the file cannot be opened or closes immediately after opening.
Assuming you can open a file and re-save it as DDL, then you can change the path to the external drive with search & replace. A slight inconvenience here is that a Windows path contains single reverse solidus (\) symbols, while the DDL "path" replaces these with double symbols (\\), thus: 

Windows:   F:\Partition\Directory\Document\Picture

DDL:       {reference "F:\\Partition\\Directory\\Document\\Picture"}
The situation is even more complex when using Windows under emulation on a Mac ... because the external drive can be accessed either directly within the emulator (by allowing the emulator to take control of the drive) or via a shared folder on the Mac side ... according to which method you choose, the path to your OPW documents/pictures will be different. 

Can anyone suggest ways of minimizing these problems?
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C.B.
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