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I am trying to find where an extension stores its data and settings so I can make a backup. In my case, I am trying to find the Reddit Enhancement Suite extension's cache and settings location.

In Windows 7, Opera extension files (.OEX) and their data and configuration is stored in this folder C:\Users\<USER>\AppData\Local\Opera\Opera\widgets\. (This directory name may vary depending on the Opera 'Program Files' folder name. This could be C:\Users\<username>\AppData\Local\Opera\Opera x64\widgets, with the 64-bit version of Opera.)

The extension data and configuration are stored in folders with filenames starting in wuid- (e.g. wuid-4e342642-00b0-09e4-08b5-63f200fbf89d), with one wuid-... folder for each extension.

How do I identify which wuid-... folder contains which extension's data and settings?

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3 Answers 3

up vote 2 down vote accepted

You can find the wuid... folder name of installed Opera extensions by opening widgets.dat in the %USERPROFILE%\AppData\Local\Opera\Opera\widgets folder using a text editor. Use the search function of your text editor to find the extension name, and then see the value of the <section id> tag above it, which should contain the wuid... folder name.

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In my case, latest Opera (new version 23) settings and data is stored in the folder(location) :

C:\Users\XXXXXXXX\AppData\Roaming\Opera Software\Opera Stable\

or another location:

C:\Users\XXXXXXXX\AppData\Local\Opera Software\Opera Stable\
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For older opera versions i.e. 6th, back up your F:\Program Files\Opera\opera6.ini file where all these MIME/extension configurations are stored

For newer versions refer the link

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Opera introduced extensions in v11, so my question does not apply for older versions (i.e. 6th). The link you provided does not show how to identify where an extension's cache and settings will be located, and which wuid folder belongs to which extension. It only shows where extension files (.OEX) are located - a detail already in my question. –  galacticninja Aug 26 '12 at 3:49

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