In Chrome version 42.0.2311.90 m, NPAPI support has been disabled by default in Chrome. Is there a way to re-enable it via the registry or configuration file?
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Modify /create this REG_SZ (string value) key:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\EnabledPlugins\1
With a value of “Java”
[if 1 exists, use 2, etc.]
Unfortunately I can't post images yet, but under EnabledPlugins, you should have a (Default) key. Add the exceptions like so:
Name...........Type..........Data
(Default)......REG_SZ........(value not set)
1..............REG_SZ........Java
2..............REG_SZ........Silverlight
etc...
The # for the name doesn't matter as far as what program it is associated with (Silverlight can be 1, Java 2, e.g.)

Patrick McKane
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Can you give me more details? – user3777528 Apr 17 '15 at 02:01
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What OS are you running? – Patrick McKane Apr 17 '15 at 19:25
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Thanks, i have find solution : – user3777528 Apr 18 '15 at 01:30
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1I find way : you can config file : "%AppData%\Local\Google\Chrome\User Data\Local State" tab : "browser": config : "browser": { "enabled_labs_experiments": [ "enable-npapi", "manual-enhanced-bookmarks" ], "hung_plugin_detect_freq": 2000, "last_redirect_origin": "", "plugin_message_response_timeout": 25000 }, it's worked! – user3777528 Apr 18 '15 at 01:30
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This worked for me. It enables NPAPI, the Netscape API which then enables items on the whitelist. Note this will only work until September when Chrome disables NPAPI forever.
Create the registry file with this content:
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\EnabledPlugins] "1"="npapi" "2"="Silverlight"
Run registry file.
- Reboot

Sam
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