How to Restore or Remove the "Compatibilty" Tab in Vista
InformationThis will show you how to restore or remove the Compatibility tab in the Properties window of all folders, files, shortcuts, and drives for all users on the computer. By default, the Compatibility tab is displayed in Properties.
NoteIf the methods below do not help in restoring the Compatibility tab, then run the sfc /scannow command to repair the C:\Windows\System32\wer.dll and C:\Windows\System32\faultrep.dll files.
EXAMPLE: Compatibility tab Before and After removed from Properties
METHOD ONE 
1. Open the Local Group Policy Editor.
2. In the left pane, click on Computer Configuration, Administrative Templates, Windows Components, and Application Compatibility. (See screenshot below)
3. In the right pane, right click on Remove Program Compatibility Property Page and click on Properties. (See screenshot above)
4. To Restore the Compatiblity Tab
A) Select (dot) Disabled or Not Configured and click on OK. (See screenshot below step 5A)
B) Go to step 6.
5. To Remove the Compatiblity Tab -
A) Select (dot) Enabled and click on OK.
6. Close the Local Group Policy Editor window. Your done.
METHOD TWO 1. To Restore the Compatiblity Tab
A) Click on the Download button below to download the file below.
Restore_Compatibility_Tab.reg
B) Go to step 3.
2. To Remove the Compatiblity Tab
A) Click on the Download button below to download the file below.
Remove_Compatibility_Tab.reg
3. Click on Save, and save the .reg file to the Desktop.
4. Right click on the downloaded .reg file and click on Merge.
5. Click on Run, Continue (UAC), Yes, and then OK when prompted.
6. When done, you can delete the downloaded .reg file if you like.
METHOD THREE 1. Open the Start Menu, then type regedit in the search box and press Enter.
2. If promped by UAC, then click on Continue (Vista) or Yes (Windows 7).
3. In regedit, navigate to the location below. (See screenshot below)
NOTE: If AppCompat is not there, then right click on Windows and click on New and Key. Type AppCompat and press Enter.
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\AppCompat
4. To Remove the Compatiblity Tab
A) In the right pane, right click on a empty area and click on New and DWORD (32-bit) Value. (See screenshot above)
B) Type DisablePropPage and press Enter. (See screenshot below)
C) Right click on DisablePropPage and click on Modify.
D) Type 1 and click on OK. (See screenshot below)
E) The registry will now look like this. (See screenshot below)
F) Go to step 6.
5. To Restore the Compatiblity Tab
A) In the right pane, right click on DisablePropPage and click on Delete. (See screenshot above)
B) Click on Yes to confirm the deletion.
6. Close regedit.
That's it,Shawn
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