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As per the test case i have created a new custom file type (.fodt) But remove is not working in Product Version: NetBeans IDE Dev (Build 201509220002) Java: 1.8.0_31; Java HotSpot(TM) 64-Bit Server VM 25.31-b07 Runtime: Java(TM) SE Runtime Environment 1.8.0_31-b13 System: Windows 7 version 6.1 running on amd64; Cp1252; en_IN (nb) User directory: C:\Users\vde\AppData\Roaming\NetBeans\dev Cache directory: C:\Users\vde\AppData\Local\NetBeans\Cache\dev These are the steps i followed 1. Invoke Options > Miscellaneous > File types dialog. 2. Click on "New.." button. 3. Write "fodt" as a file extension into dialog window. 4. Set it's Associated File Type (MIME) to "XML Files (text/xml) and click on OK. 5. Download [hello_TS_65_OptionsDialog.fodt] 6. Open "hello_TS_65_OptionsDialog.fodt" file in IDE. create a xml file and save as .fodt 7. Invoke Options > Miscellaneous > File types dialog. 8.Select "fodt" File Extension and click on "Remove" button. 9.Close the Options window by clicking on OK button. 10.Open "hello_TS_65_OptionsDialog.fodt" file in IDE. The file is still treated as XML file. Syntax highlighting, source formating etc. works properly. even after remove
Reassigned for further evaluation. This is reproducible.