Opening CAD/DWG files on a Mac

Hi,
Please can someone suggest a freeware CAD/DWG viewer - Im not fussed about editing the file - for Mac.
I know AutoDesk offer True View but that is only for Windows, the only software I have found is eDrawings from Solidworks; but after downloading the program I've found it to be a poor system to view DWG files.
So does anyone know of any free alternatives?
Thanks

I searched versiontracker for DWG CAD
http://www.versiontracker.com/dyn/moreinfo/macosx/92142
I'll let you search MacUpdate

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Sorry for the delay, I have being trying a few other options as well. I have downloaded the trial version of CS5.5 and still have the same issue. Additionally I have upgraded the dxfDWG.ai plug-in which also has not worked.
I have done as you mentioned but i'm afraid I can't understand the lines of symbols and their meanings. I have copied the first paragraph out of each file and have identified 3 changes. These are:
Differences
Original                              2012
B] It% jã= *v% †á{                 It% jã= Æx% H Ú
ø ¾gK ¹$                              A–Æz`œÅl'
WÊ?D + O                            WÊ?D +«M
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Original document
AC1018     h À                          €   àR   V                                                                              h@ø÷’*µï Ý ññ»éëß¦Û<ƒ >™$^
·GÞ³ MÈB»‹¦# Z}©Š/ ]ÔËüRYO;
Û®2 šPî`x6ý’I2öÞ}IÜ‘O ò¤élÐkÄ0· ;¡"Ê"‘á‹ ÚFÖÆ¢øFj –s Ù /ghÔ÷JJÐWhvPV bRdAëSdAËSdAkRdAkRdA (Ÿ„ ^¤
martinhorton          B] It% jã= *v% †á{     Manager     Company Category     Part Number IS 10738   Description     Project Designer   Administrator Engineer
Authority     Cost Center     Vendor     User Status     Design Status   WorkInProgress   Checked by     Engr Approved by     Mfg Approved by                                    ðU ÁQdAË dAë dAËQdAËQdAø ¾gK ¹$ %m Ô6((WÊ?D + O    ç P    7 °N
Document opened and saved in 2012
AC1018     h À    ?    ?                €   àR   V                                                                              h@ø÷’*µï Ý ññ»éëß¦Û<ƒ >™$^
·GÞ³ MÈB»‹¦# Z}©/ ]ÔËü(DO;
Û®2 šPî`x6ý’I2öÞ}IÜ‘O ò¤îlÐkÄ0· ;¡"Ê"‘á‹ ÚÖKÛèøFj –s Ù /ghÔ÷JJÐWhvPV bRdAëSdAËSdAkRdAkRdA æg‡ fn                 alantyrrell           It% jã= Æx% H Ú     Manager     Company Category     Part Number IS 10738   Description     Project Designer   Administrator Engineer
Authority     Cost Center     Vendor     User Status     Design Status   WorkInProgress   Checked by     Engr Approved by     Mfg Approved by                                     ðU ÁQdAË dAë dAËQdAËQdA–Æz`œÅl' %m Ô6((WÊ?D +«M    ç P    7 HM
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Opening CAD/DWG files on a Mac

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