Thanks to นิติกร คำภักดี.
To set Everything to use the Thai language:
- Download the language pack Everything.lng.zip
- Unzip Everything.lng from the language pack into the same location as your Everything.exe.
- Restart "Everything".
- In "Everything", from the Tools menu, click Options.
- Click the General tab.
- Select your ภาษาไทย (TH) from the Language dropdown list.
- Click OK.
- In the "language change" popup, click OK to restart "Everything".