Adobe PageMill data
File type: Various data file
An stmi file is a data file used by Adobe PageMill, a WYSIWYG HTML editor.
The format is obsolete and is not intended as a standalone document format.
File type category:
Various data file
Date updated: October 16, 2026
Record marked as obsolete and not updated for a long time.
The stmi file extension is associated with Adobe PageMill, one of the first WYSIWYG web HTML editors from Adobe. PageMill was available for Microsoft Windows and Mac OS.
An stmi file contains internal data used by PageMill. It belongs to the PageMill working environment rather than being a general-purpose HTML or image file.
Adobe PageMill is discontinued, so the stmi format is no longer in common use.
Open an stmi file with Adobe PageMill on a compatible legacy version of Microsoft Windows or Mac OS. PageMill is discontinued and may not run on current operating systems.
The file may not be useful on its own; it should be opened from the PageMill environment or together with the related PageMill files.
If the file can be opened in Adobe PageMill, recover the associated web content by saving or publishing the pages as HTML and copying the required assets. This does not convert the stmi file itself.
Language