The related link below (at www.fileinfo.com) has good information about this. Since I use Windows, I chose to download the free VideoLAN VLC media player (also see Related Links below).
PTX is the extension for files created by E-Transcript. You can download the viewer of these files at http:/www.reallegal.com/softwareDownloadETranscriptViewer.asp
It is also used by Pentax...
It depends what it is, it could be any one of the following files: - Alpha Five Data Dictionary File - Alphacam Laser VB Macro File - Chief Architect Library File - Cubase or VST Backup Song File -...
There are several software that create or use alb extension so depends on which one you have:
1) image commander album = used by paint shop pro
2) cubase = a music production program, a backup song...