How to add Subtitles to already created video file for .avi format on Windows 8?
This can also be accomplished if you have VirtualDubMod and a TextSub provider installed such as VobSub or VSFilter.

To use VobSub, during installation you must select the Plugins -> TextSub for VirtualDub and Avisynth option.

To use VSFilter, you must locate the VSFilter.dll file in the installation directory and copy it to the plugins folder with the extension changed to .vdf (e.g. VirtualDubMod\plugins\VSFilter.vdf).

Once you've installed one of them:


Open the .avi file in VirtualDubMod
Select Video -> Filters from the menu or press Ctrl + F
Click Add and select TextSub from the filters list and press OK
A file navigator should have appeared, select the .srt file.
Optionally, at this point set up the compression under Video -> Compression. Save the merged file with File -> Save as AVI