Microsoft Document Connection cache file
File type: Temporary file
A .mdccache file is a cache file created by Microsoft Document Connection.
It stores temporary data used by Document Connection while working with documents.
File type category:
Temporary file
Date updated: October 4, 2026
Record marked as obsolete and not updated for a long time.
Microsoft Document Connection was document collaboration software from Microsoft included with Microsoft Office for Mac. It ran on Apple macOS, formerly called Mac OS X.
An .mdccache file contains cached data used by Document Connection. It is a temporary support file rather than a document intended for editing or distribution.
The format is obsolete, and current macOS software generally does not use it. The file normally has meaning only to the older Document Connection installation that created it.
An .mdccache file is not intended to be opened directly. It is an internal cache file, not a document format, so general-purpose applications cannot display it meaningfully.
On an older Mac, Microsoft Document Connection may read the file automatically when needed. If the associated software is no longer installed, there is usually no practical way to open the cache file.
An .mdccache file cannot be meaningfully converted because it is temporary cache data rather than an editable document.
To preserve the information it represents, use the original document from the connected service or local storage and export or save that document in an appropriate format.
Software applications that handle other tasks involving mdccache files:
Apple macOS / Mac OS X
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