Last time I did that was in ArchiCAD 9 and it went without a hitch. Back then you had to make sure the file was saved in multiplatform format, but I
think
that is automatic now.
Although it appears that if you intend to use modules, there are some caveats. Here's what GS has to say about it:
Modules: Multiplatform Issues
Host files located on either MacOS or Windows based computers can accommodate modules created on the other platform.
However, moving the host file to the other platform will require that you manually select the appropriate file for each hotlink by clicking the Change Hotlink button in Hotlink Manager. (File > External Content > Hotlink Manager). After this, the host file will store hotlink path names according to both platform standards. If you then change any Hotlink to point to another file, the path name for the other platform will be cleared.
For more information, see Hotlink Manager Dialog Box.
Note: There is an exception to this rule. If this file has the same name as the one the Hotlink previously pointed to, the path name for the other platform will be preserved.
Although it is possible to use Hotlinks having the same file name but placed at a different location as long as you’re working on either MacOS or Windows, moving the file to the other platform will merge these different path names. Therefore, it is recommended to use different file names for different module content even if you’re working in a single-platform context.
Also, Eric had a few issues last year, but they may have been resolved by now:
here and
here. If you find out, let us know.
Cheers,
Link.