Opening Ldf File
Ldf extension stands for SQL server log files. You have chance to open idf files with Sql Interface.
It is used with MDF and LDF files that used by Sql database. The actual informations are found in Mdf file. However, some database softwares may need a LDF file to open it.
You can try to run with Microsoft SQL server Express edition. But, if the mdf file was produced by another software, it is better to run with this program.
There are different database viewer softwares to open ldf files you can easily find via internet.
Opening methods of Ldf file
Links to opening Ldf file