Every time I download anything I get an error message stating ...could not open ....dmg because it is either not a supported file type or the file has been damaged." What do I need to do to fix this problem?

For the last month or so, every time I download anything I get an error message stating "........could not open ...... .dmg because it is either not a supported file type or because the file has been damaged...." I do not know what to do to fix this issue. Any ideas?

hmmm.... try this
basic troubleshooting:
Repair Disk Permissions http://support.apple.com/kb/PH5821
Repair Disk http://support.apple.com/kb/ht1782
reset ACLs http://osxdaily.com/2011/11/15/repair-user-permissions-in-mac-os-x-lion/

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