I get an Error: Line 3, Error writing file.
What's wrong? using 3.4.9

Dim File_Handle, Boolean
FileOpen( "C:\\Temp\\BCCTemp.txt", "LineMode", "Write", True, File_Handle )
FileWrite( File_Handle, "Hello" )
FileClose( File_Handle )

File handle is a number not a boolean value.

Please change first line in your code to
Dim File_Handle, number

: I get an Error: Line 3, Error writing file.
: What's wrong? using 3.4.9

: Dim File_Handle, Boolean
: FileOpen( "C:\\Temp\\BCCTemp.txt", "LineMode",
: "Write", True, File_Handle )
: FileWrite( File_Handle, "Hello" )
: FileClose( File_Handle )