When the June 28th patch is applied to existing Office installations XLS files generated by the Infragistics.Excel object are flagged as having a bad format and a "Do you want to continue?" dialog appears, if you say yes the file is opened successfully. XLSX files appear to be okay...
I'm currently using version 10.2.20102.2064, is there a later version that resolves this problem?
I don't believe something like this has been reported or fixed recently. I have forwarded this post to the Developer Support Manager and a DS engineer will be contacting you about this issue.
Thanks Mike. I inadvertently left out the name of the update which causes the problem: “Microsoft Office File Validation Add-in”.
(It evidently also causes extreme slow-downs in opening workbooks on network shares as well…)