Adobe Reader Installers
On Windows, Adobe pushes out Adobe Reader updates as .msi (for full installers) and .msp files (for patch installers). For example, Adobe Reader 9.1, which was a full installer, was an .msi file, and Adobe Reader 9.1.3, which was a patch installer, was an .msp file.
Change in MIME Content-Type for .msi Installers
Currently, the MIME content-type for .msi files is set to text/plain. From September 19, 2009 and onwards, the MIME content-type for .msi files will be changed to application/octet-stream. According to our testing, this change will be more robust when downloading .msi through a variety of firewalls.
From an end-user perspective, there is no impact of this change in the way Adobe Reader is updated via the Adobe Updater.
Knowledge Base Article: http://go.adobe.com/kb/ts_cpsid_51355_en-us
By Steve Gottwals
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Created
September 21, 2009