If this fixes the issue, right-click the file again, go to > Compatibility , and check Run this program as an administrator to make the fix permanent. 3. Change the User Directory Location
Go to > Update & Security > Windows Security . Select Virus & threat protection . dolphin iosfs failed to write new fst
Scroll to and click Manage Controlled folder access . If this fixes the issue, right-click the file
The most common cause is Windows Defender's , which prevents unauthorized apps from writing to the "Documents" folder where Dolphin typically stores data. If this fixes the issue
: You can also use the Dolphin registry key to point the UserConfigPath to a new location, such as C:\DolphinData\ , though this is more advanced. 4. Check Antivirus Exclusions