Question: how to open gll file?
Answer: GLL File Extension. ... 
Step 1 – Verify whether the file is properly associated with selected software. ... 
In order to open GLL file, focus on steps 1 and 2. ... 
Step 2 – Install a program that supports GLL files. ... 
Programs that support files with GLL extension.
Step 3 – Check for other possible causes of errors.