Importing an Integration Services package into SSIS

Hi

There is a package file located in our C drive that I want to open and investigate (Created back in 2015 not by me), however when I login to SSMS integration services and try and import the package from C there is no C drive just File System then MSDB and a couple of other folders with nothing in them of note.

How do I get this package into the MSDB folder from C drive? I only see those folders when I try and add existing package to a new project in Visual Studio, so guessed I need to import the file there (MSDB) first.

If i try opening file in Visual Studio it gives error:

There were errors while the package was being loaded.
The package might be corrupted.
See the Error List for details.

Thanks
A