Anyway to set WAD back to a previous time?

My PWAD crashed in Slade and now I am not able to get access to all my maps in in Doombuilder or in Slade. I attempted to use a back up file but it has not worked and I have the same problem.

If back files don't work its might be a problem. Do you try any other editors like XWE or SlumpEd? Maybe you can use them to copy some part of files.

SLADE makes a backup before saving, should be called <filename>.wad.bak in the same directory as the wad.