How i can see comments in my S5D File from PLC?

The comments are not available from a program upload for the S5 / S7-300 / S7-400. In those days memory was very expensive and had to be used for only the essentials.

Only the recent (2010+) S7-1200 and S7-1500 has the comments as part of the PLC loaded program.

No comments are stored in the S5.

If you make a backup of the S5, then you only have the pure program code, no comments. The program code is in the S5D file.

If you have the original file with comment then you can set it on setting page (where you click on PLC to go online) to show not only comments even tags and network comment.

If you don't have original backup with all settings then you have to make it your self by starting from Bit addresses of inputs and outputs then slowly you will find out what each network does and you can put comments for them as well.

In S5, for any comments, tags and other setting, S5 make a file for it with the same name but different extension, also any comments you put inside each PB or FB or ... a new file will be made in side the project that you can open them and just see the comments you have for each Network.

Example of an S5 project with multiple files for the same project and the only different is the last 2 characters of each file name.