I was looking for a way to access my mac files when using vista bootcamp partition in vmware when I found this thread, so I thought I'd share what worked for me.
To explain what I am doing and why, I decided I wanted to be able to boot in either OSX or Vista if I wanted to, and also to run Vista side-by-side on vmware. I had originally just been running Vista in vmware (no bootcamp partition at all) but ran into some problems and had to reinstall vmware.
When I reinstalled and set it up for use with bootcamp, I found I couldn't access files as I had been able to before with the other setup. I wanted to be able to use a program on Vista that would access (and write to) files stored on Mac.
This was what worked:
To enable shared folders for a virtual machine
To add a shared folder
1 Choose Virtual Machine > Settings or click the Settings button in the toolbar to open the virtual machine Settings sheet. Place the cursor on Shared Folders so that it is highlighted.
2 Click the add (+) button in the lower-left corner of the Settings sheet, and select Add Shared Folder. The Shared Folders section of the virtual machine Settings sheet is displayed.
3 Select Enabled.
4 In the Name field, enter the name of the shared folder on your Mac.
5 In the Path field, enter the path on your Mac to the shared folder or click Browse to browse for the folder.
6 Select Read-only to prevent the virtual machine from changing the contents of the shared folder on your Mac. Access to files in the shared folder is also governed by permission settings on your Mac.
7 Click Apply.
Note Do not open a file in a shared folder from more than one application at a time. For example, do not open the same file using an application on the Macs operating system and another application in the virtual machines operating system. If one of the applications writes to the file, data could be corrupted.