I have a folder of .dspproj files from about three years ago that I think were generated under a version of Sigma Studio from that same era. When I attempt to open any of these, Sigma Studio starts, but eventually just brings up a blank page, as if it were ready to start a new design, and there is no explanation or error messages that pops-up on the screen. I've tried both the 3.1.4 and 4.2 versions of Sigma that I have on my machine, both functioning well with other designs, and both behave this same way. Other Sigma files from another folder in this the same time period open just fine under 4.2, and open with expected error messages under 3.1.4.
Here are the first few lines when I open one of these un-openable files with MS Notepad:
I wonder if anyone sees something glaringly wrong here. I'd be happy to share one of these files if someone here might shed light on this. The only difference I note between this file and one that will open is in that third line. Where this file reads: SStudio.DesignDoc[funny b], one that opens reads: SStudio.DesignDoc[accented u].