If you just changed the extenstion from .tiff to .sig that will not work. Need to change it back.
SIG is an image file format created by Broderbund. SIG files hold images used for signs or posters in a proprietary format.SIG files can be opened and edited by Broderbund graphics software, such as PrintShop and Print Master. SIG files cannot be opened on non-Broderbund software, but can be converted to .JPEG form using an image converter.
Thanks Curt, What is an image converter? is it separate software?…
Yes, a separate application. Are you on Macintosh or Windows?
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Here's a free one (among many others):
Of course, Google has a bunch of them for you:
http://www.google.com/search?q=free+sig+image+converter+windows&hl=en&gbv=2&gs_l=heirloom- hp.1.1.0l2j0i22i30l8.1327.7397.0.112126.96.36.199.0.0.0.139.1144.0j9.9.0...0.0...1ac.1.12.heirl oom-hp.HCPwVIEYG6o&oq=free+sig+image+converter+windows