FakeRom v1.0

if not fs.exists(".rom") then
    fs.copy("rom", ".rom")
end

oldfsopen = fs.open
oldfslist = fs.list
oldfsexists = fs.exists

function testOpenWithRomEditor( _fPath, _fMode ) --This also does shell.run :D
    if _fPath then
        _fPath = string.gsub( _fPath, "rom", ".rom")
    end

    return oldfsopen( _fPath, _fMode )
end

function testListWithRomListing( path )
    if path then
        path = string.gsub( path, "rom", ".rom")
    end
    return oldfslist( path )
end

function testExistWithRomFinder( path )
    if path then
        path = string.gsub( path, "rom", ".rom")
    end
    return oldfsexists( path )
end

fs.exists = testExistWithRomFinder
fs.list = testListWithRomListing
fs.open = testOpenWithRomEditor