http://developer.apple.com/library/mac/#documentation/cocoa/Conceptual/PropertyLists/AboutPropertyLists/AboutPropertyLists.html%23//apple_ref/doc/uid/10000048i-CH3-46719-CJBIGFCD

No. writeToFile: writes a property list representation of the dictionary and 
from the above you can see that NSDictionary must have String keys to be a 
property list. 

You could turn it into NSData and write it like that perhaps. 

On 04-Oct-2010, at 8:45 PM, Remco Poelstra wrote:

> Hi,
> 
> In the NSDictionary documentation it is stated that NSNumber objects are 
> valid property list objects.
> But when I create a dictionary with NSNumbers as keys, writeToFile: fails. If 
> I use strings, then it succeeds. Is it possible to use NSNumbers as keys and 
> have the, read/written from/to file?
> Thanks in advance.
> 
> Kind regards,
> 
> Remco Poelstra
> 
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