cocoa - Formatted text encoding in binary plist -

i'm trying scripting edits binary plist file. plist describes objects contained in dvd studio pro file. appears text box in dvd studio pro encoded in plist base64 data describes text string along formatting. can't seem figure out how understand data. ideally, i'd able alter text string not formatting. following seems describe text box says "menu title here". there 2 strings, 1 key called "dictionary" , other called "string"; both cfdata. ideas how can parse or convert format can edit directly? i've been playing around writing little converter in cocoa, no luck yet.

<dict>                                             <key>dictionary</key>                                             <data>                             batzdhjlyw10                             exblzihoa4qb                             qisehaxou0rp                             y3rpb25hcnka                             hiqitlnpympl                             y3qahyqbaqas                             hisece5tu3ry                             aw5nazseassg                             tlngb250hpke                             hiqgtlngb250                             hpsvjiqfwzm2                             y10gaaaaggaa                             ap/+tab1agma                             aqbkagearwby                             ageabgbkagua                             aaceawyvhafj                             ajsbmwcbaias                             hjaxb05tq29s                             b3kgkosehado                             u0nvbg9yajsb                             ayqezmzmzopz                             8ni/g/dvbz+d                             7otrpwggkosw                             lwtou0v4cgfu                             c2lvboashise                             ce5ttnvtymvy                             aiseb05tvmfs                             dwualiqbkosa                             monhx9c9hpke                             lpcntlnpymxp                             cxvlbmvzc4as                             hj6ghiqbzkea                             hpkelpcqtlnq                             yxjhz3jhcght                             dhlszyashise                             ee5tugfyywdy                             yxbou3r5bgua                             liqeq0nauwaa                             hqcgkoswlxfo                             u0jhy2tncm91                             bmrdb2xvcoas                             hjuba4qczmya                             aiag                                             </data>                                             <key>string</key>                                             <data>                             batzdhjlyw10                             exblzihoa4qb                             qisehbjou0f0                             dhjpynv0zwrt                             dhjpbmcahiqi                             tlnpymply3qa                             hzkehiqitlnt                             dhjpbmcbliqb                             kw9ozw51ifrp                             dgxliehlcmwg                             hajpsqepkose                             haxou0rpy3rp                             b25hcnkaliqb                             aqwshjawdu5t                             t2jsaxf1zw5l                             c3ogkosehaho                             u051bwjlcgce                             hadou1zhbhvl                             ajseasqehafk                             nqcgkoswlgto                             u0v4cgfuc2lv                             boashjuchiqb                             zp6dr8fxpyas                             hjawee5tugfy                             ywdyyxbou3r5                             bgwgkosehbbo                             u1bhcmfncmfw                             afn0ewxlajse                             bendqfmaaiua                             hpkelpygtlng                             b250hpkehiqg                             tlngb250hpsz                             jiqfwzm2y10g                             aaaaggaaap/+                             tab1agmaaqbk                             agearwbyagea                             bgbkaguaaace                             fyqbywcjaama                             owcgkoswlgdo                             u0nvbg9yhpke                             hiqhtlndb2xv                             cgcuowgebgzm                             zmad8/jyp4pw                             728/g+zraz8b                             hoag                                             </data>                                         </dict> 

that's base64-coded nsarchiver archive. need decode base64 first, use [nsunarchiver unarchiveobjectwithdata:]. "dictionary" entry above looks after decoding (in python syntax because used pyobjc):

{     nsbackgroundcolor = "nscalibratedwhitecolorspace 0 0";     nscolor = "nscalibratedrgbcolorspace 0.94902 0.937255 0.921569 1";     nsexpansion = "0.1053606";     nsfont = "\"lucidagrande 21.00 pt. p [] (0x103110b60) fobj=0x103110c30, spc=6.64\"";     nsobliqueness = 0;     nsparagraphstyle = "alignment 0, linespacing 0, paragraphspacing 0, paragraphspacingbefore 0, headindent 0, tailindent 0, firstlineheadindent 0, lineheight 0/0, lineheightmultiple 0, linebreakmode 0, tabs (\n    28l,\n    56l,\n    84l,\n    112l,\n    140l,\n    168l,\n    196l,\n    224l,\n    252l,\n    280l,\n    308l,\n    336l\n), defaulttabinterval 0, blocks (null), lists (null), basewritingdirection -1, hyphenationfactor 0, tighteningfactor 0.05, headerlevel 0"; }