LCK file extension is for Lock file
especially for database access control
Similar to LCK
A21 - Soundweb Firmware File
A2A - APLASCII EISPACK file
A2A - IBM Voice Type Language Vocabels File
A2A - Sharp APL Workspace Export File
A2B - A2B Player Playlist
A2M - AudioToMidi Settings file
A3 - Unrelated Inventions Audiotools Show Log
View all in File Extensions